It's all about markets and television ratings now and what is trendy and hip. And OKC was a market that didn't appeal to Durant. There was no loyalty with him, he said "Screw it I'm tired of being Messi'd around here I'm going to join a ****ing good team."
This has been going on time and time again in the NBA, from Boston engineering a coup to basically dominate the NBA for 2/3 years...to Miami constructing the Big 3, to Cleveland luring LBJ back and bringing Love aboard, to this. This sport is about superpowers. It's them and everyone else.
That's why there is no parity in this league. That's why I don't watch anymore.