Er, why don’t we just have some Marines beat them up next time they protest at a military funeral? I’m sure the police could arrange to have other business at the time.
I actually suspect that something like that is just what they want.
Those Westboro monsters - and they are monsters - would take a bruising, then sue for millions. It's their payday.
While I certainly don't condone any illegal actions - except perhaps against monsters - a sophisticated computer attack against Westboro would fit right in with the concept of righteous street justice.