We already got compensated for Doc leaving.
For one, Stevens is looking like as good, if not better, is cheaper, and we got a 1st round pick. Doc didn't want to be with us and coach a rebuilding team, so let him walk.
As far as other teams trying to pirate other coaches, well, if I own an NBA team and I see a good coach, why wouldn't I try to pirate him? If I can pay compensation to void that contract, I would if it means getting the coach I think will put my team to the next level.
I don't think the Celtics should be insulted in both scenarios. We got something in return for a coach who wanted out anyway, and we have a coach who's so good, he's a hot commodity.