I know someone who walked away from three different fatal car accidents where all of his friends died and he was the only survivor - all three times. That isn't something I'd want to be known for. Talk about a case of survivor's guilt.
My cousin's husband beat his former best friend within an inch of his life while he was drunk because he found out that his friend had been sleeping with his mom. Needless to say, he probably would have gone after him and pounded him even if he'd been sober when he found out, but he probably would have stopped before earning himself a felony prison sentence. He hasn't touched a drop of liquor ever since he got out of prison. He doesn't question whether or not he's an "alcoholic" or not, he just knows that he only allows himself to do stupid things/make terrible decisions after he's been drinking. I've always really respected him for that.