Why is it hypocritical to criticise fundamentalism when you do like the subject matter in general? You could easily be a devout Muslim, yet want nothing to do with suicide bombers.
Also, just because people do good for the world does not mean they're beyond criticism. It should be allowed to criticise anybody. Your trying to silence an (imho valid) criticism goes against a freedom that isn't too far from that championed by FOSS: free speech.