I was thinking that there must be something that Westboro church could get nailed on. It struck me that they could be considered domestic terrorists so I looked up the definition of Domestic terrorism and, aha, found their actions fit under the following section.
(5) the term “domestic terrorism” means activities that—
(A) involve acts dangerous to human life that are a violation of the criminal laws of the United States or of any State;
(B) appear to be intended—
(i) to intimidate or coerce a civilian population;
here’s a link for full text http://www.law.cornell.edu/uscode/718/usc_sec_18_00002331—-000-.html
So does this mean that they can be charged as terrorists? I hope so. If you know please comment.