This is a result of people giving up their time and effort to do a first aid course, a readily available course that most of us think would be a good idea...but also an easy thing to put off.
Two days later there was a crash outside my house. With "DRSABC" and "30 to 2 no matter who" still fresh in my mind I went through the drill.
Sadly, there was nothing I could do for the driver, who was killed instantly. But that drill stopped me from rushing about in a panic. I could check the other victims - all unhurt - and relay information to emergency services.
No, it was not ideal. But the security blanket of having done that course...priceless. I urge everyone who gets the chance - please, do a first aid course. You could save a life.