The only part you skipped was why other politicians suck Trump’s dick.
And your answer — “It’s a cult of personality” — is the answer to why — because it is, those other politicians must pay him fealty or risk getting primaried by deeper-in-weeds MAGAs e.g. what happened to Liz Cheney (who is now btw actually campaigning for Harris).
Also Trump lies. And keeps lying even after being called out. He has and has never had a moral compass. Very hard to fight that if you do have one. And if you’re a cult leader, the cult believes and re-amplifies your lies until they become truths.