Let's see, with smoll brain like me, I imagine that the bullshit (if he ended up slaughtering all of the villagers) are either cannibalism, they be snitching to the princess, or the MC is just so far down into his 'vendetta' that he remembered a slight offense they did and decided to erase them out of existence.
If he does kill the villagers, might as well kill all of them. It's bad rep, but cutting a source of hatred (spared children) erase some inconvenience in the future... that is if the MC still wants to live after his 'vendetta'.