[Mr. Mojo]

"What do they do that is so disgusting (besides being rather tasteless for protesting at a soldier's funeral)?"

Their "protests" at soldiers' funerals aren't simply "tasteless," they're abhorrent.

[Jedi Master Pikachu]

It is "abhorrent," but that isn't the same as murdering people (a reference to your Manson analogy).

So is there anything very bad that they do (that makes the news) other than protest at soldiers' funerals and call homosexuals bad names? Although those are "abhorrent" or "tasteless," it isn't as though they are killing people, or even that they want people killed.