I know ENTIRELY what they advocate. However, they're not doing any killing (in Westboro's case, I believe thats both as an organisation AND no members acting independently). They ABSOLUTELY should be allowed to do this. Its their right specifically because of freedom of speech. Similarly, Muslim clerics just calling for generic action is also freedom of speech. If they are organising and planning how to do such acts, that is a seperate matter. I would ask what you are referring to in saying that people are punished again and again for exercising freedom of speech.