Remember Rule 2: Survive. If there are non-good people in the world and they mess with you, you kill them too. Simple. But noooooooo, Rick and his crew of crybabies have to agonize over it, spend countless hours second-guessing themselves and babbling on and on about "what kind of world this will become ..." Dude, I got news for you: whatever kind of world it's about to become, it ALREADY IS!
So just shut up about it already and do what you have to do. Please, no more moralizing and twaddle about sacrifice and loyalty and all that hooey. Kill your enemies and move on!
But how do you know who the non-good people are? That’s the central dilemma of the show. If you’re going to rebuild society you need people, more people that your current survivor group, but some of those people might be no good, they might try to take over your group, they might just be there to steal from your group. But maybe the people trying to take over aren’t bad, maybe you should let them take over. Maybe the thieves aren’t bad, maybe they’ve kids over the hill they’re trying to feed.
They SHOULD agonize over it, because that’s what SANE people would do. They’re trying to rebuild society, and you can’t rebuild society as a group of murderers. Sane people have a problem with killing, even in self defense.
But who is the enemy? Remember most folks in Woodbury had no idea the Governor was a sleezebag, if you kill all of them you’re killing good people, people that could have been allies if they had information (people that became allies).
The moralizing is where the plot is. The moralizing is where the interesting story is. The moralizing is where the thinking is. What you want is Zombie Stripper the series, you should just watch that movie every week.