Phelps and his group are nutcases no doubt but other than being disrespectul to the families of casualties (I'm for shooting them on site for that) they do not appear to threaten or bring about violence to anyone else. They attempt to propagandize others to their belief but I dont think many are buying.
Anyway it would be a strong fallacy to compare them remotely to the islam groups/mullahs et al that constantly cry for murder and Jihad in their efforts to cleanse their world of "Infidels"
if any of the Phelps group accidentally trip and run into a full metal jacket nine millimeter round no one would complain for the most part but other than that and pissing off real Americans of good character they are just a bunch of misguided idiots to be ignored.
"Proud to be an Infidel" ... "100% pure American Jingoist"