Originally Posted by
kyoryu
Well, there's an interesting contradiction here. If there's something that says "killing evil outsiders is always okay, because they're made of evil", then that carries the presumption that they *can't* be good. They're just flat out incapable of it, in the same way that humans are incapable of breathing water.
Allowing evil outsiders to then become good (which is a prerequisite for being a paladin) means you've already houseruled them enough that that particular rule doesn't make any sense any more.