I agree with most of that. The only quibble I have is that the BNP are participants in a political process that I believe is legitimate, and to that extent I think they are legitimate. I might want to improve the system, but I wouldn't consider banning the BNP from participating in it to be an improvement (although I'd certainly consider a system where they didn't get elected because fewer people wanted to vote for them to be a considerable improvement).

Of course, I understand the reaction as an emotional response, and so have a lot of sympathy with the politicians who walked off-stage during Griffin's and Barnbrook's acceptance speeches. I'm not sure I'd have resisted the urge myself, had I been in their position, even though I think it's the wrong thing to do.