His attitude is fine. He wants to win. He's just not making enough plays. Simple really.
The "attitude" of a one-man offense trying to take about 3 people off the dribble and turning it over or taking a bad 3? I can see he wants to win, but he's simply not good enough (at least this year) to continue trying to be Michael Jordan in end game scenarios. If it's reasonable to try and make a play, fine, but he's forcing too much (ex: watch the play when he got to the rim & missed the 2 FTs. He had an easy pass to a baseline-running Sprads for a wide open 3, but was too busy trying to force something to even see that it was available).
It's this same attitude I've been frustrated with most of this year.