Kearney has previously conceded some of his players are still learning how to cope with the weekly demands of the NRL, and question marks remain over the team's ability to handle the big occasions.
"Jeez we're bloody looking for everything aren't we," said Kearney.
"Well, that's a part of the competition. I watched games last night with the Australian national anthem in aboriginal language and English, so there's a time frame there. No, those are excuses."
However, veteran Warriors forward Simon Mannering admitted after the five-tries-to-none thrashing that he had concerns about the side's tendency to drop their guard during the delayed start to both the Storm and Roosters defeats.
"I was actually thinking about it afterwards, it was a similar situation with the Melbourne game," said Mannering.
"I'm not too sure, it's definitely no excuse to perform like that but maybe it's something we need to look at. If it's a game coming up with something like that beforehand, we need to make sure we're aware that we've got to get going from the start.
"It is a bit of a lull but it's no excuse. The Roosters went through the same thing and they started well and the same with Melbourne."
First-choice hooker Issac Luke missed the match with a shoulder injury but participated in the pre-game festivities when he and Roosters centre Latrell Mitchell, who is of Indigenous Australian heritage, exchanged gifts and hongi.
Luke also played in the eight-tries-to-two thrashing at the hands of Melbourne, but was at a loss to explain why his teammates lacked energy this time around in front of 14,095 fans.
Luke is expected to return to the side for Friday's away match against the Eels in Sydney, while fill-in halfback Mason Lino is awaiting the results of scans on an ankle injury that forced him off 13 minutes from fulltime.
"That's something you have to embrace," said Luke.
"Because in Melbourne, it was tough because it felt like it was all about Melbourne, whereas here it was all about us.
"So it goes both ways, but in saying that, the Roosters turned up to play and soaked up the atmosphere before the game.
"The boys will get back on the horse. It's a long competition and we get a chance to play a desperate side next week in Parra so I'm just looking forward to that."