It's crunch time when you want to play it a crunch time. Pop wanted to play the last 3 minutes as garbage time.

down 4 possessions, a couple of 3-pt plays and a couple of Spurs stops/Wiz misses, and we got crunch time. never give up.
Like many have said, it isn't that important of a game to waste an effort trying to come back. And as for the whole building up confidence thing: in a team mostly filled with vets and players who have already won a few championships, one come from behind win won't do anything for them they haven't already done for themselves.