Believe me, I understand what you're saying.
Let's see how it plays out. If the Spurs win tonight, then of course even considering resting the starters will be viewed as a bad idea. But if the Spurs lose and Tim/Manu look drained and subsequently play poorly in game 7, or if Tony's hamstring gives out tonight, then people will question whether Pop should have rested his star players, knowing their advanced age (Tim/Manu) and questionable health (Tony).
The emotional part of me says play everyone big minutes and win the le tonight. The practical part of me says for this specific Spurs team, resting the starters is not as dumb of an idea as you might think.
What will piss me off more than anything is if everyone plays, but then Pop pulls them out at the first sign of significant adversity (double-digit lead, for example). If everyone's gonna play, then play them. Don't give up. That would accomplish nothing.