Although his views are messed up, I really fail to see any legitimate reason for banning him, Zapk. The internet is the internet and you can't help what other people's beliefs are. If you knew everyone's beliefs by looking at them, I'm sure you'd be offended by many more people than him. What he said is just common idiocy spewed by a lot of attention-seeking trolls. Really, the fact that you banned him kind of made you look like you gave into a troll.
If you want to look at it from the view that you're banning someone who deliberately asked you how you thought about burning the blacks and Jews, then that's okay. But he didn't say "I want to burn..." he said "How do you feel about..." Therefore, he did not declare his personal beliefs (in the server) which really poses no threat. That's like asking a vegetarian host about how they feel about slaughterhouses and then getting banned because the host assumed they wanted to troll them for it.
Well, I'm not saying what he said was justified or anything, but you really shouldn't ban people for having an opinion. Seriously, people have different religions than others. This is the internet. I'm sorry, but you can't change that.
(If this post makes no sense, I'm sorry, it's 4AM and I'm really tired.)