the most charismatic people of all time were psychopaths.
Who generated this list of *most charismatic people of all time* of which you speak?
IMO, JFK was one of the most charismatic of all time. Hardly a psychopath. Same with Jackie O and even JFK jr. Not psychopaths, I'm pretty sure.
I think plenty of people would classify Angelina Jolie as charismatic. I suppose it's possible she's a pyschopath but for her rainbow family's sake, I hope not.
Muhammed Ali? Charismatic. Hell, Conan O'Brien is charismatic. He seems like the farthest thing from a psychopath you can get.
I could go on. And one person's charismatic is another person's supercreep. Some of Charles Manson's followers said he was charismatic but I quite clearly see psychopath. Same with David Karesh and Jim Jones, both who were described at length as being charismatic.
So I'd have to say that I heartily dissagree with your subjective assertion that "the most charismatic people of all time were psychopaths".