I'm not sure Kupchak's really the one to blame for picking up players that start shit with Kobe. For example, I heard Kobe himself was looking to convince some of his fiercest rivals to come to LA, like Raja Bell.
Considering how competitive Kobe is, it wouldn't surprise me if he was specifically asking for players who he knows are really competitive and passionate too. What better criteria than the short list of players who dared to start shit with Kobe?
I mean, if you look at Artest and Kobe's recent playoff history vs each other, it ain't too pretty either, but you can't say Ron doesn't have the competitiveness and passion for winning that Kobe appreciates.