They're insane, but also a tiny minority, thankfully. I think that they get a disproportionate amount of media attention, which probably just encourages them.
Out of curiosity, Tiger, what do you mean by banned? Are the members themselves banned from Canada and the UK, or the church organization?
Edit: After visiting their website, wow, how can such a tiny organization have so many protests. They claim to have had over 53,000 pickets. Also:
0 - nanoseconds of sleep that WBC members lose over your opinions and feeeeellllliiiiiings.
That's...interesting.