He moved to SF in late 2011. I'm guessing he moved to or was in the cheaper hipper places, which is exactly where the crazy, homeless, drug dealers, dropouts, and trash hang out. They were there before he was. How long has the Tenderloin been the way it has been, specifically how many decades?
This is a rather standard gentrification wedge issue rhetoric being regurgitated without understanding the background. At least the PR people got to him this morning to start working on fixing the damage.