If I was the father, I would have whooped his ass too.
First off, the dad was completely right, she was playing an R-18 game about knocking up your little sister, and that is just plain wrong. And then this dumbass tries to be a white knight and say that game was his. I would have kicked his sorry ass for playing an eroge about impregnating his little sister on her computer, disown him and then throw him out of the house.
There was NOTHING Alpha about what he did.
People look up to what he did simply because I am certain that they get off to loli porn and want to sniff their sister's panties. I will pretend that the show ended with the father killing him and the little sister before turning the gun on the mother and himself.
Even animals know imouto love is wrong. Are you lower than animals, Japan?