You were spot on. That team would be unwatchably bad if something happened to Luka. I would guess that nobody was playing hard at that point in the game anyway so there wasn't much harm in leaving him in for another 5 min or so, but still. It would have looked real bad if something did happen.
I also hope that at some point you're able to look past all the chest pounding taking place here (which is a bit much I agree, even as a Luka, err, enthusiast I guess is the right word) and enjoy watching the kid play basketball sometime just as a fan of the game. We only play the Mavs 3 or 4 times a year. The rest of the time you can still enjoy seeing a unique talent do his thing every once in awhile. It'd be a shame if the very vocal contingent of draft mourners here have ruined any chance of that for you forever. I'm a Kings fan but I can still appreciate a good play regardless of team affiliation. Nothing Luka does at this point is actively harming the Kings anyway, unless it's the playoffs in which case he's just gonna have to lose, obviously.