Counter-protesting the Phelps mob isn't going to change them, nor is infiltration or display of lewd acts. Either one of these two is the case:
1) They don't actually believe what they spout, doing it solely for the settlement money. Telling someone they're wrong when they don't believe it themselves gets you nowhere.
2) They believe so intensely, so blindly, that any opposition merely reinforces their faith. E. G., a furry making out with a transvestite is a "test from God" to "tempt" them into sin.
This is a group of family members that was raised by the brain-washing Phelps into thinking what they're doing is right. In 20-25 years, we'll see if they're still around--once Fred dies of old age, could be that there'd be nobody able to corrupt the family's youngest generation, and the whole thing will fade into history. On the other hand, who knows...