Yeah, its a rediculous accusation
I think Pierce has looked absolutely exhausted out there, and I think I might buy into theories that his will to fight through the fatigue disapeared a bit, when he found out KG was out for the playoffs. However, if that is the case, I think it would all be completely subconscious.
Paul Pierce is one of the most competitive athletes I have ever seen. I think there is legitimate concern of whether he has enough left in the tank this year to turn it on for more than a game at a time, but I would never question his heart.