There is nothing to debate with the master debater UnBiased. This kind of leech just enjoys upsetting righteous people and derives pure sexual gratification from his evil acts. It is correct to compare him with Nazis because Nazisms antisemitic attitude was beyond logic. Cretins like Unbiased are perfect evidence of human stupidity and severe mental retardation.
I vote for banning the coward.
I don't know what the right thing is. On the one hand, characters like UnBiased sicken me, and their contemptible opinions are so disgusting that I want nothing to do with them. On the other hand, I've generally believed that the only people we shouldn't debate are the ones who are putting forward a great lie (like holocaust denial or that the government was responsible for 9/11). I wouldn't debate those types. But I think that there are people like UnBiased, who are going to be spewing these abominable ideas, and G-d forbid, people might take them seriously. I think they need to be defeated so that observers can see what is so wrong and abhorrent about their ideas.
But I do understand why some people would prefer to see such people banned and not want to bother debating them.