I don't think we have all the information to decide. If he really killed innocent civilians purposefully as IRI media say, then IMO he is as evil as IRI. If he only attacked military targets, then it may be a different story.
All the evil in the world started when someone thought: "Well I will just do a little evil to accomplish a noble goal." As Ref put it nicely, once you start justifying means through ends, there is no stopping. That's precisely how IRI got to this point.