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Because his supporters don’t care if he’s a gibbering idiot as long as he tells them their particular deplorable -ism is perfectly valid and fine. He gets the racist votes because he tells them that they’re right and all the non-white people are inferior and out to get them. He gets the Christian votes because he tells them that the US has, is, and always will be a Christian nation that should be run by their particular flavor of Christianity and btw all the non-Christians are out to get them. He gets the homophobe and transphobe votes because he tells them yes, LGBTQ+ is a choice, they’re all perverts, and they’re all out to get them and their children.
Basically he tells everyone that’s on the wrong side of history who have been told that they are terrible people for decades that they are in fact not terrible people, that they’ve been right all along, and that it’s all a conspiracy by liberals/democrats/minorities/homosexuals/satanists/whoever to get them, and they eat that shit up. As long as he keeps spouting support for their particular prejudices he’ll keep getting their votes, because they rather elect a gibbering moron who validates them than someone sane and competent that tells them their prejudice is wrong.
You shouldn’t underestimate people’s tendency to just do what they’re told and not rock the boat. Network head likes Trump interviews because it generates views, which attracts advertisers. Trump is a petulant child and will refuse to do interviews with any network that points out he has the mental capacity of a child. So the network head mandates that nobody is allowed to question Trumps mental state for fear of him refusing future interviews. Since their boss said so, the network talking heads just go along with it.
As for the politicians, they can’t recalibrate to the reality that is Trump. They’re used to playing political chess with their equals and along comes the pigeon known as Trump to walk all over the board knocking pieces over and shitting everywhere. They literally have no playbook to deal with him. Normally this would be where the “referee” steps in which depending on context would be a debate moderator, the Supreme Court, or Congress, but the debate moderators won’t touch him because of the previously mentioned reasons, the Supreme Court has been stuffed with puppets that have a vested interest in protecting him, and Congress is so deadlocked and dysfunctional they can’t even pass legislation with bipartisan support nevermind impeaching him.
Trump is the perfect storm of everything the US political system was never designed to counter. Every single check that was supposed to prevent this sort of thing has either been subverted or just plain failed because the supposition it was built on was faulty. He has highlighted that far too much of the US political apparatus has functioned purely by convention and concepts of fair play and as soon as someone came along that didn’t give a shit about any of that it all crumbled.