"Because people are the real assholes." His expression twists up before he shakes his head.

"It would've been, but it didn't happen that way." And from Negan's perspective? It was Rick's group at fault. Who in the hell slaughters people in their sleep? He kills, sure, when he has to, but it's not reckless slaughter. Lives are a valuable commodity in the apocalypse, you don't waste them.