Because he knew that fans needed something to complain about, and he sacrificed his defense for that. I say that's a true MVP skill right there. You name me 1 other player in the NBA (named Brandon Roy) who is willing to forgo defense because he knows fans need something to complain about sometimes?
So do you think the players on the Blazers are responsible for setting the tone on defense, or is Nate at fault when his team doesn't play great defense?