Giving Nick Griffin the platform to spread his bullshit to the mass and to be accepted on a mainstream politics show were quite expectantly met with a lot of hostility and protests at the BBC by anti-fascists groups. There was also fear that violence against ethnic minorities will escalate because of this, though there's no doubt the BNP would unadmittedly justify violence towards non-whites, however lets not give them too much credit at this point. To be fair the racist numskulls would cause harm towards ethnic minorities regardless. Yes, I'm talking about those imbeciles who go around and harassing ethnic takeaways at night. Or those cowards who think ganging up on a defenseless foreigner would some how make them superior. Though I wouldn't be surprised that they also make up a fair number of the far right supporters.
The BNP is hardly the forefront of racism in the British society as most people make them out to be. IMO fighting against a fascist or far right only tackles a certain aspect of racism, because racism can be found in any part of the political spectrum and society even where it's not expected (but I won't go too much into that for now). Though the growing threat is imminent, especially with the current state. One of the best ways to tackle this problem is to expose them through open debate and not censoring them, because otherwise that will only play into their advantage of using 'self-vicitimisation' to gain support.
So should BBC allow Nick to appear on the show in the future? Personally I prefer not, seeing his ugly face once is enough. Let's hope as one of the audience suggested he and his party be sent to the South pole before that happens.