As a counter argument, whiel I cna understand Cleveland ( Dan Gilbert ) being upset with LeBron leaving, the Cavs basically had 7 years to put a competant team around LeBron.
They had one of the greatest prospects in NBA history coming onto their team. They could have completely stripped the team from day one to build the ideal team around James.
Had they gone to the lottery for three staright years, made good choices and maybe got 2 studs and another solid guy or even just one stud and two other solid pieces.
Then, just added free agants and vets around that nucleus, by years 5, 6 and 7 they would have been competing like MJ just before the Bulls took off.
I think a complete and total lack of management is also to be noted in James decision to leave.
I doubt very much he would have left if he was "the king in Cleveland" and they were strong, legitimate for title contention each year, and...he had a couple legite wing men.
He might have still laughed with Wade and bosh over beers about playing together, but his end response would have been, get your own guns cause the Cavs are coming for you.
So I understand why he left. Didn't think he did it very well, but also think the Cavs management had a role in it too.