This episode was a big, f***ing mess. Let's look at the message here... "lol murdering a wife-beater is totally alright and justified". This is what happens when a man like Seth Macfarlane tackles a delicate issue; the man has no real understanding of the problem. He arrives at the most blunt, thoughtless conclusion.
Let's not kid ourselves; Family Guy characters are exceedingly one-dimensional. The abusive boyfriend in this episode was no exception. All he did was shout about beating his wife; there was nothing even vaguely realistic about his character. There was nothing human about this character at all (or anyone else for that matter, but that's a separate issue). The only way anyone can say that murder is an appropriate solution, is if they truly believe such people ARE the hollow shell represented by this episode.
And guess what, f**ing Seth Macfarlane, they're not. They are very complex, and some very disturbed and harmful, but everyone is human. Who the f***k are you to assume they never learn or change, and then decide it's appropriate to kill them. Who are you, God? You're too smart for the justice system? Because, obviously, you don't agree with it, so I guess you're above it.
Family Guy is the least enlightened thing on television. How people find the show insightful is beyond me. It's just too shallow; shallow minds, shallow humor, shallow characters. Peter Griffin is not even human anymore, he's like a fat, retarded Woody Woodpecker. You have vapid retardation mixed with... more vapid retardation, under the guise of "mature subject matter".
My advice to Seth Macfarlane is: stop pretending to be an intellectual. You obviously don't know how to be impartial, you never scratch below the surface. You're not mature enough to see beyond paper cut-out stereotypes, so stick with the only thing you do know- vomit and potty humor.