I agree with you that, given his history, he does not manage his symptoms consistently well. However, my take is this: if he isn't a problem in the locker room (which I've never heard to be the case), I don't think his off-court issues should matter. He can play basketball and he would help out team a lot by doing his job on the basketball court.
You're ignoring the report that he followed Von Wafer off the court and was said to have thrown the first punch in that 2010 locker room fight. Or that the Mavericks suspended him twice in less than a month for "conduct detrimental to the team".
If you sign Delonte West, you know that eventually he's going to blow up and cause a scene in the locker room. You just have to decide if an occasional outburst is worth what he can do on the floor.
I watched the video of he and Wafer playing the heated game of one-on-one that lead up to that fight. It didn't seem different from what I expect to happen in practices fairly often among monsters with elevated levels of testosterone/cortisol, at the highest level of competition. No mention was made of what exactly precipitated the game and ensuing fight, and reports suggest it ended then and there.
I wasn't aware of the circumstances behind his suspension in Dallas. The phrase "conduct detrimental to the team" could literally mean anything, and is doubly obscure given the initial suspension was "lifted the next day". Obviously something went awry, but I'm not sure what to make of that.
Can he be difficult? Yeah. I don't know that he's that far from the norm among his peers, though. No doubt he needs expectations and boundaries made very clear to him. And I believe he should be strictly held to them. But in the end, the Wafer fight didn't strike me as being outrageous (didn't Jordan punched Longley in the face?), and these Dallas reports are too obscure for me to form strong opinions about.