Update: I was listening to Locke's podcast yesterday, and according to Locke, the Jazz were dead last in the league in defense for the month of March.
You can blame the players, sure, but you also gotta blame the coach. Either, the Jazz players simply aren't capable of playing good defense or are just bad defenders (Looking at the level of athleticism on the team, I'm less inclined to believe this one), the defensive schemes don't work well, for whatever reason (this is more credible to me), and/or Corbin doesn't do a good job teaching/motivating his players to play defense (this also seems more credible to me).
I cannot believe that dead last defensively in the league fulfills Lindsay's objectives for Corbin and the team at the beginning of the year. Honestly, and with all the objectivity I can possibly muster, I just do not see how the Jazz can renew Corbin's contract and seriously tell the fans that they are committed to building a winner.