Miles Davis was not a cool guy in real life, many, many issues. And some of the others mentioned here also not cool in real life. Harming oneself is one thing, harming others is quite another.
I also saw Miles live towards the end, the audience treated him as a god, basically all he could do at this point was blast out a single note from time to time. Really one the worst displays of trumpet playing I've ever seen, band carried the show, he was missing in action.