I don't think you can single out any one person to blame; there may be issues with IT, Lue's coaching, Love's relationship with teammates, etc, but I still think the Cavs disfunction is mostly an issue of design. The team is full of egos and guys who are past their prime, so naturally they have severe accountability problems. Plenty of analysts had that concern going into the season, and it's clearly proven to be an issue.
Maybe Love will ask to be moved, but I still think IT gets shipped out of town. Seems like it's been a tense fit with him from the beginning- remember how the Cavs wanted the Celtics to throw extra assets into the deal after they'd already agreed on it in principle, based on the notion that IT was "soiled goods"? I doubt floating that claim that made IT feel wanted or welcome.
If he's jacking up shots and playing selfishly right now, it's not surprising-- the Cavs culture doesn't suit him, and vice versa. They're not going to pay him this summer, so he'll be gone one way or another. Might as well try and trade him by the deadline for a useful piece, hopefully one that would appease Lebron.
They could (and probably should) try to deal IT for Kemba Walker, but it would certainly cost them the Brooklyn pick.