Sour grapes. Thankfully, Danny Ainge knows that "fair" has nothing to do with trades. You make the best move for your team, and anything less is not worth doing.
Signing TT and Teague was MORE desirable than trading for Myles Turner at $18M / year, and on top of that, it's apparent that other teams didn't want to give up much to flip Turner.
Indiana is mad about the reality that they couldn't trade their bench player signed to a large contract, for a guy getting $100M+ on the open market? That they might have had to add *1 year* of Oladipo to get it done? Meh. Life ain't fair.