Hatred appears to be what fueled a young Japanese man who went on a stabbing rampage, killing 19 people today at a facility for the mentally disabled where he had been fired.
Months earlier, he reportedly gave a letter to Parliament outlining the bloody plan.
When he was done, Satoshi Uematsu, 26, had left dead or injured nearly a third of the almost 150 patients at the facility in a matter of 40 minutes in the attack, the deadliest mass killing in Japan in decades.
Twenty-five were wounded, 20 of them seriously.
He drove up in a black car, carrying several knives to the Tsukui Yamayuri-en facility in Sagamihara, 50 kilometers west of Tokyo, according to security camera footage played on TV news programs.
He broke in by shattering a window at 2:10 a.m., according to a prefectural health official, and then set about slashing the patients' throats. Details of how he did that, and if the victims were asleep or otherwise helpless, were not immediately known, although a cryptic letter he sent to Japan's Parliament in February gave a peek into Uematsu's dark turmoil.
He calmly turned himself in about two hours after the attack, police said.
Tsukui Yamayuri-en, which means mountain lily garden, was a facility Uematsu knew well, having worked there since 2012 until he was let go in February. He knew the staffing would be down to just a handful in the wee hours of the morning, Japanese media reports said.
Not much is known yet about his background, but Uematsu once dreamed of becoming a teacher. In two group photos posted on his Facebook, he looks happy, smiling widely with other young men.
"It was so much fun today. Thank you, all. Now I am 23, but please be friends forever," a 2013 post says.
But somewhere along the way, things went terribly awry.
Uematsu began to tell people around him that disabled people needed to be killed. In February, he tried to hand deliver a letter he wrote to Parliament's lower house speaker demanding all disabled people be put to death through "a world that allows for mercy killing," Kyodo news agency and TBS TV reported.
Uematsu boasted in the letter that he had the ability to kill 470 disabled people in what he called was "a revolution," and outlined an attack on two facilities, after which he said he will turn himself in. He also asked he be judged innocent on grounds of insanity, be given 500 million yen in aid and plastic surgery so he could lead a normal life afterward.
The letter was reprinted by Kyodo after the attack.
"My reasoning is that I may be able to revitalize the world economy and I thought it may be possible to prevent World War III," the rambling letter says.
The letter, which the Tokyo police got, included Uematsu's name, address and telephone number, and reports of his threats were relayed to local police where Uematsu lived, Kyodo said.
Kanagawa Gov. Yuji Kuroiwa apologized for having failed to act on the warning signs.
From his time working at the facility, Uematsu was known to people in the area, and some said he was so polite and upstanding that they found the news shocking.
Akihiro Hasegawa, who lived next door to Uematsu, said he heard Uematsu had gotten in trouble with the facility, initially over sporting a tattoo, often frowned upon in mainstream Japanese society because of its association with criminal groups.
"He was just an ordinary young fellow," he said.
Yasuyuki Deguchi, a criminologist, said Uematsu's actions were typical of someone who bears a grudge and seeks revenge, because it appeared he planned out the attack, and then he turned himself into police.
"Accomplishing his goal was all he wanted," Deguchi said on TV Asahi.
Michael Gillan Peckitt, a lecturer in clinical philosophy at Osaka University in central Japan, and an expert on disabled people's issues in Japan, said the attack speaks more about Uematsu than the treatment of the disabled in Japan.
"It highlights the need for an early-intervention system in the Japanese mental health system. Someone doesn't get to that state without some symptoms of mental illness," he said.
Mass killings are rare in Japan. Because of the country's extremely strict gun-control laws, any attacker usually resorts to stabbings.
In 2008, seven people were killed by a man who slammed a truck into a crowd of people in central Tokyo's Akihabara electronics district and then stabbed passers-by.
In 2001, a man killed eight children and injured 13 others in a knife attack at an elementary school in the city of Osaka. The incident shocked Japan and led to increased security at schools.
As recent as earlier this month, a man stabbed four people at a library in northeastern Japan, allegedly over their improper handling of his questions, although no one died.In 2010, 14 were injured by an unemployed man who stabbed and beat up passengers on two public buses outside a Japanese train station in Ibaraki Prefecture, about 25 miles (40 kilometers) northeast of Tokyo.
Dear Lower House Speaker Tadamori Oshima,
Thank you very much for reading this letter. I can wipe out a total of 470 disabled individuals. I am fully aware that my remark is eccentric. However, thinking about the tired faces of guardians, the dull eyes of caregivers working at the facility, I am not able to contain myself, and so I decided to take action today for the sake of Japan and the world.
My reasoning is that I may be able to revitalize the world economy and I thought it may be possible to prevent World War III.
I envision a world where a person with multiple disabilities can be euthanised, with an agreement from the guardians, when it is difficult for the person to carry out household and social activities.
I believe there is still no answer about the way of life for individuals with multiple disabilities. The disabled can only create misery. I think now is the time to carry out a revolution and to make the inevitable but tough decision for the sake of all mankind. Let Japan take the first big step. Would Mr. Tadamori Oshima, who bears the world, use his power to make the world proceed in a better direction?
I sincerely hope you would deliver this message to Mr. Shinzo Abe.
This is the answer I reached after serious thinking about what I can do for humankind.
Dear Lower House Speaker Tadamori Oshima, would you lend your power for the sake of dear Japan and all humankind?
Please give this full consideration.
It will be carried out during the night shift, when staffing is low.
The target will be two facilities where many multiply disabled people reside. Staff on guard will be strapped with cable so they can't move and can't make contact with anyone outside. The act will be carried out speedily, and definitely without harming the staff. After wiping out the 260 people in two facilities, I will turn myself in.
In carrying out the act, I have several requests. After my arrest, my incarceration should be up to two years, and please let me lead a free life afterward. Innocence on grounds of insanity.
A new name (Takashi Iguro), government registration and documents such as a driver's license needed for everyday life.
A disguise for regular society through plastic surgery.Financial aid of 500 million yen ($5 million).
I would like these conditions to be promised.If you can make your decision, I will carry it out at any time.
Please consider this fully for the sake of Japan and world peace.
I hope with all my heart that this can be discussed with Prime Minister Shinzo Abe, although I am sorry to trouble him in an unimaginably busy schedule.
- Satoshi Uematsu (address, telephone number) - Worker at the Kanagawa Kyodokai