Regardless of the reason people visit these places, the moment they get external pressure, their believes get vindicated. We see a large surge in issues with these communities since we got on our little censorship trip. It is just plainly the wrong move to make.
There have been Nazis on the internet since shortly after its inception. But random people going out and shooting crowds in this frequency is a new phenomenon.
Historically censorship has always been applied for the right reasons of course.