Lou shouldn't be shooting the 4-6 times per game he is now, he gets in trouble when he gets isolated against quicker players (about all others), and he gets beat when he's tired. But people miss some of the things he does well; help defense in particular*. Plus, his role has been reduced this year and he's playing fewer minutes, but like I've said, Frank trusts him. And when you gain Frank's trust like Lou has, you get a little bit bigger margin for error and you are going to play.
*Yes, this is a current gpc talking point, but its a valid one.