Because at some point the people asking the questions said 'We're just asking, if it's possible that Black people might NOT be genetically inferior to white people, that's all. Why are you trying to shut down the debate?'

THAT in a nutshell is why you should allow idiots to ask questions - because as soon as you start insisting everyone who asks questions might be an idiot - the quicker you steamroller over a compliant demos.

You might have to go panning through idiots to find gold - but sometimes it's there. Questions are necessary. :o)