I don't remember which town did this, but there was a town where the WBC people were planning to demonstrate at a military funeral, and one of them shot his mouth off about it in town the day before the funeral. He got a beating on the spot.
Then, townspeople found the motel at which the WBC jackals were staying, easily found by the Kansas plates in the parking lot, and lo and behold, the WBC found all their cars blocked in in the parking lot by double-parked cars, and they were unable to leave for their protest. They called the cops, of course, and the cops called a tow-truck to impound the cars, but ask the wreckers must have been tied up, because they said it would be hours before they could respond, and the car owners showed up before that and removed them, but it was too late for the WBC protestors to make it trip the funeral.
Then, before they left town, some of them got detained by the police because they fit the description of some people involved in a crime in town. Well, it turns out that that had nothing to do with it and were released a few hours later.
I don't think the WBC will ever protest in that town again.
As for Joplin, I predict that this insult will be too much to bear on top of their tragedy, and some fisticuffs might occur.