Well if some home invasion takes place and then there is this guy pointing a gun at me and tells me to cheat on my woman in front of her with one of his gunwomen...

it sort of would make me consider it.

I'd cheat. I want the characters to have the best ending ever! At least, the best, they can considering they're trumatized for life.

Not until I go for specific endings. Trying to ace it in one go kind of ruins the point of Until Dawn.

Oh, in a game yeah I'd probably just try to play the way the game intended. In real life, we're hardwired to survive, so unless we find ourselves in a situation where internally, we have a moral objection to 'what it takes', then it's likely everyone would cheat to survive.