Pops has every right. He doesn't owe the Miami home crowd anything. He owes his own fans...if periodically resting starters gives San Antonio the best chance for a title, it's Pop's duty to do this.
Stern is out of line.
Knowing now that there's actually a rule in place against this, it makes it a shade of gray for me. I can see right and wrong on both sides. Still, ultimately I think teams should be able to rest however they want.