your dad is a human being.
it's fukked up when you realize your parents aren't demi-gods but just regular flawed human beings. some are cool, some are lame, some are responsible, some aren't, and then some are in between. think about some of your homies. some of them are probably parents. their kids will grow up, get to your age and then ask themselves the same questions about why their pops are this way or that way. but to you the answers will be clear. it's because your homies are who they are. your dad has some homies who see it clear as day too. known him since he was your age. your dad just happens to be a semi-bum (no disrespect). it is what it is...