My $.02.....
Butler was the best player on an average team that was going nowhere. Maybe, maybe, the Bulls upset the Celtics if Rondo doesn't get hurt. Maybe, maybe that leads to getting the #3 and Josh Jackson. Beyond that, Butler had two years left on his deal before his player option, which there was never any reason to think he wouldn't use it, and you risk losing him for nothing. Maybe you don't make the trade, but is it worth another 8 seed in the playoffs where you get bounced?
Bottom line is that Butler has earned, through his own hard work, all of the accolades he's received, plus the money that he'll get when his deal is expired. That said: we're talking about a guy who on the floor for the worst limp dick performances in playoff elimination games that I'm sure any of us have ever seen out of the Bulls.
For better or worse, the Bulls have tied themselves to Fred, and the way Fred wants to play basketball. Anyone who has watched the offense that Fred wants to run, and has also watched how Butler operates in game knows that the two don't mix. It simply doesn't. All the bitching and moaning we could possibly do over what this roster looks like no longer matters. This is Fred's team, and we need to get used to that fact.