This is the type of game that makes you think irrational thoughts about tanking because losing on purpose is preferable to trying to win only to have the other team keep you at arm's length the whole time with execution and pure talent that is so obviously superior that it's insulting.
That's not even the case here, though. Kawhi is obviously far, far superior to anyone on the Celtics. He's an elite, MVP-caliber guy, and that disparity should not be undersold. However, the Spurs only other elite talent was in street clothes. Who was the Spurs second most talented guy playing tonight, Danny Green? We're not getting out-talented; we're getting outplayed.