unable to separate the genius in his music from the turmoil of his personality
That seems so odd to me. Certainly the two are inextricably linked, as they are for so many others.
Monkey, there are two things that are probably worth understanding about it. The first is that this sort of modern "Coldplay stole my song" lawsuit almost never would have happened back then; it would have been settled between the artists, or by the labels, or in extreme cases by brutes hired by the managers or labels, etc. So unless you were very closely plugged into the scene, you wouldn't even hear about most of the conflicts or resolutions. We have a very different conception of how things should be resolved these days.
The second is that for music coming out of the blues tradition, and for music that is essentially one of cooperative development, the very notion of "thievery" doesn't really come into play until it's very blatant. Everyone's quoting and riffing off of each other, studio and live acts are a game of musical chairs (and closing off future opportunities by ramping up hostilities isn't always wise), and it's not always completely clear that moment X from a given song had its genesis with one person...even when antecedents couldn't be found, which they very often could. For many -- I wouldn't be confident enough to say all -- the issue was less thievery than credit; "I don't care if you steal the song, but don't claim it was all your idea." And for some, even that formulation wouldn't occur; they'd just assume it was yet another instance of the session or band leader taking credit, which happened a lot.
I'm not really excusing it, mind you, I'm just explaining how it's not useful to think about it in modern terms.