Quote Originally Posted by Oberon Kenobi View Post
Point to the wars, the barbarian hordes, the bandits and plagues and whatever else that turned man, woman and child into corpses in the first place. That's your real evil.
Plagues are a good one, I think. Especially if they can be attached to some sort of creature which you can fight. Building up an army and attacking the plaguebearers is just asking for a bunch of martyrs, which you really don't raise more than once at a time. But an army of skeletons? They'll be immune to the plague and can directly combat the beasts that is carrying it. They can also be raised en masse from the bodies of those killed by the plague, lending a bit of retribution to a necromancer's propaganda.

Depending on how the plague works and how exactly undead bodies function, they might even still be acceptable in society afterwards. (If they need to be quarantines or are carriers after, then it just means they are destroyed or kept in exiled areas when not in use - given how cheap undead can be made, that's not a large problem.)