@ Rain -Sorry, typo
Anyway, Irish has amnesia about his life prior to being 7 and at that point he was already at the camp. So Irish has
no perfect life planned for himself. He's fully expecting to die before he reaches 17 since the skull suit is already destroying his body due to his overuse.
Irish and Ichika also like to face the hardships of realitu head on and not retreat to a safe place. Irish continously fights for what he believes in and Ichika fights to make the world better for everyone, not just himself, so he won't accept it either.
If PT does it, it's most likely after Irish finds out his only family is working for them, so his perfect life wouldn't be an alive family. Irish doesn't find it hard to turn away due to his self destructive outlook on himself. Also, all he cares about is Joshua's freedom, not his own satisfaction.
I don't know about Kyuukai, but neither of the first 2 will find it hard to turn away the temptation.