Does your knowledge of how dangerous a fight can be make you more hesitant to intervene as a bystander?

What do you call the type of person who purposely makes themselves suffer, but not directly, like you notice your chicken is undercooked but instead of fixing the issue, you just eat it anyway?
Does staying at one job for thirty years provide more security than changing jobs every few years?
How can remembering your own bad days help you react more kindly to a rude cashier at the store?