I am an occasional hunter, and I share your fathers views. Even if I was looking for a gun for a home defence situation, I would avoid an assault rifle. Unless you believe you will be attacked by a rabid or very determined large gang, you don't need the 20-30 rounds of an assault rifle magazine. Usually, you will have a bit more than a split second to point your gun in the right direction too. There's also things like bullets going through walls and floors and hitting innocent bystanders to consider. I'd go for a shotgun. It will stop an assailant, but not necessarily kill, and hunting with it it will remain a gun you know and can use well.