This is a tough one. You wish there was a way to stop these people from their campaign of hate. Anyone who has at least a little bit of knowledge about the Bible knows that this group is motivated by hatred and it will be the cancer that will ultimately destroy their souls. If you want to cringe through a documentary that explains this family watch "Fall From Grace". Some of his children have escaped this cult and it is interesting what they have to say about growing up in the Phelps household.
After Phelps Wins, Uncertainty about What Lies Ahead