I think it's still harbored for a couple of reasons. First, LeBron still thinks to this day that he did nothing wrong. I think if he would just come out and say that the way he went about leaving was inappropriate then a lot of wounds would start to get healed.
Secondly, him leaving is going to cause a HUGE financial blow to the city of Cleveland, a city that could already ill-afford the loss. The ramifications of him leaving may very well turn Cleveland into the next Detroit, or worse.