I don't like to believe anyone is a lost cause either and I believe every life has value but with him, he will either have to hit an incredibly horrific rock bottom or die before he does.
He has had restraining orders against him before and been ordered into domestic violence classes. He laughed off the domestic violence classes calling them his door kicking classes because what prompted it was him kicking my mother's door in. The police have been at his house more times than I can count.
The other side to him, is a nice guy. He will help anyone, anytime. If he would stop drinking, he would be the nicest guy you ever met. But yup, I have to walk. It took me a long time to come around. Hopefully, he will someday.