Would you ever forgive your father if this happened to you?

That's ludicrous! A gun to the head is way too far for any human being to another. I'd definitely get the hell out of there and seek the help of other people. I wouldn't speak with my dad for a very long time, and I would stay safe with other people until I knew for sure that he would receive treatment or is extremely repentant. In my head, I would always try to forgive him and try to understand his reasoning (if any), but I would make sure that I felt safe if I were to ever come close to him again. I'm still unsure if I would sever ties for the rest of my life, since people make mistakes, and that would just be a lot bigger than other mistakes. I mean, if it were to happen repeatedly (twice is more than enough), then I would probably move on.

Jam it back in, in the dark.