But should the right to free speech apply to organizations like the WBC? I think not.
Yes, it should. I want the WBC to bugger off even more than the next, perhaps, because as a Christian I feel like the WBC isn't representing the true Gospel, the true point of Christianity, and therefore gives Christians a bad name.
However, just because you don't like someone's message doesn't mean they aren't supported under the first amendment. As long as they're demonstrating peacefully (or at least nonviolently), I think that they should be allowed to continue for as long as they'd like.