Can you name me a law that would have put them in jail? I might be missing what they do, but if they only put those pesky "God hates fags" signs, then I see nothing applicable.
here you go.
Please, stop that pathetic slogan. You are not defending their freedom. You are defending your misunderstanding of the world.
On the contrary. As soon as those idiots from the WBC are being silenced, someone else will be next. This is the same mechanism that is used for other methods of government surveillance. It starts out as anti-terrorism or anti-child pornography, but will soon be used for petty crimes and regular unwarranted searches.
Like in Germany you have a codified freedom of opinion. An matter of opinion can not be an insult and cannot otherwise be against any law (as freedom of opinion tops any other law). From what wikipedia claims with all your "freedom of speach" you do not even have that in the US.
German law differs a lot from U.S. law. German law is eventually governed by the European Convention on Human Rights. This, in turn, provides an exception for "protection of morals". Which is exactly the clause that undermines the entire protection, as "morals" are locally defined.
The U.S. constitution does not have that exception, which is why it is my belief that freedom of speech is better protected in the U.S.