Jim Jones, of the Jonestown Massacre. The cult leader who we got the phrase "drinking the Kool-Aid" from (though they actually were too poor to get Kool-Aid and they laced Flavor-Aid, the off brand version, with cyanide instead). When he started out, he was actually a very influential Civil Rights activist who is responsible for the policies that would later become the foundation of the civil rights laws in his home city. But he later became a crazy cult leader and by the time of the cult's mass suicide, he ranted like Trump does today.
As for how anybody could believe that Trump's a good businessman, many people only know him as that guy from The Apprentice, not the businessman who has bankrupted multiple casinos, an airline company (and beauty pageant for young girls who he flew around the country with in his private plane - just him, the girls, and a man by the name of Epstein), and who couldn't even sell steaks to Americans.
You answered your own question. I spent years playing the game of "This image is a JPEG. Will the website force me to save it in a format that can't be opened by the basic Windows photo viewer, or will it actually be a JPEG when I download it?"
You'd be surprised how often it would turn out to be the former rather than the latter.