There are stupid people who are harmless (think Forrest Gump). Whether they have the capacity to be "good", I'll leave that up to you.

I stand by if evil then stupid (and thus if not stupid then not evil) with reasoning above, retract the implication that the reverse holds (if stupid then evil). I could use more precise terms than "evil" and "stupid" or qualify more, but I choose to be provocative, so it makes it a bit easier for you to attempt to prove me wrong.