cool music. uncool musicians.

sort of following on from the previous discussions, how do we sort out the discontinuity with the cool-ness of music, with the un-cool-ness of the musicians?
a couple of cases in point are:

miles davis: drug addict, child neglecter, wife beater

queen: hopelessly amoral. not just the obvious reasons either

foofighters: support a "charity" claiming AIDS is a conspiracy

janis joplin, jimi hendrix, jim morrison: members of the so-called "27 club", all who died drug-related deaths (at age 27)

now, i love the music these people make, despite their (a)moral standing, but i sometimes ask the question, if they would have made the music they did, were they not the type of people they were?
i wonder whether their life of excess, and the resultant polarising affect they had (have) on people, actually drove them to create the kind of music they did

(of course, this applies to artists aswell - think brett whitley, h.r.geiger et al)

whilst i have nothing against the sons of korah, the creative edge we see in these others is often breathtaking.
perhaps it's all to do with the closeness between genius and madness.
maybe someone can point me in the direction of a morally upstanding, well-collected, widely renowned, genius? i, as always, am happy to be reproved.

this isn't about dissing these people who i regard as gifted. however i'm quite happy for you to diss the idea