I just posted a big long answer about this in the other thread!
No, I don't think so.
I don't think it would be any different from 'normal' BH. We can have debates on normal BH too.
I agree that posts/ posters that are offensive should be removed rather than a thread closed. I also think that a warning system by mods would be handy, rather than just shutting a thread and not telling anyone why. Something like "There have been complaints of racism in this thread" - anything so that people know what the problem is, and can rectify it rather than get shut down.