[Feanor of the Peredhil]

The point is, there are some players that, when wolf and when innocent, act noticably different. There are some players that you are more confident in your ability to gague. And there are some that you will never understand regardless of anything pertaining to anything else. Mormegil, for instance: if he's a wolf, we're screwed; we'll never know... it would be mere whim that would ever have us catch the dear.

See what I mean? If you kill the players that you are completely uncertain that you'll ever be able to nail down in any situation, you'll simplify your own life.

Of course, the village would be more boring without them, but you might keep your sanity longer.