There are people on this world that are stupid, intellectually challenged or just... lack education and understanding. Some are easily manipulated, naive and believe his lies. Some are evil and nasty and tend to gravitate towards people like Trump. And there are those people who have undiagnosed personality disorders and Trump probably reminds them of a toxic relative that raised them. Then there are the fans-idolizers - people that need to be in awe of someone that in their mind is powerful, rich or even dangerous. There are the people who vote for him, just because he is the Republican nominee and that's it. And there are the absolute crazies too - they exist too - the conspiracy theorists and people that don't live in this reality. He really knows how to get under their skin.
History has seen people choose even worse than him. I don't even want to utter some of the names. You all know them. And history has seen people idolizing monsters and killers and psychos.
In my heart of hearts, I believe this time history will NOT repeat itself. Kamala is just so much better and her rise in the past few weeks is... legendary at this point.