I believe Dez just wants to win but I also believe he is like Owens in the sense that he hates seeing his talent go to waste in an offense that is horrible.
Dez means well. And when his mind is clear and he isn't frustrated, he truly is a team-player. But he is easily controlled by his emotions, and that's why he never can contain the outbursts and tantrums.
That, and the fact that Dez over-evaluates and overestimates himself. He's not as talented or athletic as he was 3-5 years ago. His lack of production falls on him as well, not just the horrible offense.