Quote Originally Posted by Lazymancer View Post
What arguments? It depends on specific campaign and interpretations of alignment.

For example, if necromancer considers murdering some of the PCs and resurrecting them as his undead lieutenants radical optimization of the party to be an option (even potentially; with explicit agreement of players - if not characters), it would be somewhat dishonest to pretend that it is Neutral behaviour. Similarly enough, I would prefer Drow characters to be Evil, even if they aren't actively behaving as such due to necessity to conform to the surface morals.
Well, animating undead creatures is specifically Evil, so even if the grand scheme isn't to brutally murder the PCs, most necromancer characters are Evil by default. That sort of applies in general to any sort of "black magic" or whatever your equivalent of the setting is. The guy that binds devils to topple the BBEG is probably Evil, even if he works towards the same goals as the Good or Neutral PCs, the method is kind of abhorrent.