Not going to comment on your personal situation, I don't know you or your dad, and I've no right to comment on that specifically but in those kind of instances I would put forward the case that person knows the likely outcome from drinking and I'd question the sober decision to still drink anyway knowing in advance there's a strong possibility of violence. Others may think very differently, but for me, you get a pass for acting like a total dick once maybe twice under the influence, anything after that becomes a habit and you can no longer use that as an excuse.
I go to most games, I know many people who shovel so much stuff down their neck and up their noses it doesn't seem possible and yet they wouldn't ever be aggressive unless under extreme provocation, being an annoying twat is about their limit. conversely, I know lads who would get into a scrap with somebody for almost no reason whatsoever sober, the drink and drugs just speeds it up.