Because the people that support him are weak.
They hear and see "admin" and they think "oh he's the dude that made everything so he would know better" or "oh shit, he has power over everything, better not step out of line". It''s why you have people to this very day take his advice on anything tech related when he can't even fucking get his server running correctly. You still have zombies that will shill Brave because the logic is literally "that's what Null said to use, and Null runs KF, so he must be right!".
Add into the fact that their self-esteem/personality is fucked to where they desperately want to feel like they belong, so sticking with the cult to them is the much easier preferred way than going against the grain like the many few have. It's why you'll see rational well thought out posts get sticker-bombed to death because if it's not in line with what Null says, then it MUST be wrong because bladdy-bladdy-bloo.
That's ontop of the fact that a lot of users on that site will say one thing and do the exact opposite. The games section easily comes to mind with this, because you will have people heavily criticize a company for doing stupid shit, and in the same breath go "well I'll still buy the game anyways", like nigger wtf is your problem?