Problem is, you need rocket science to get reelected. This isn't about saving kids or stopping criminals. If one of those gets accomplished along the way, that's all well and good. It's about votes.
EDIT: Watched the video. Nice! I gotta say, since reading your arguments, Matt, I agree with you. This kind of ordinance can't hurt much, and it will potentially help keep children (and grown-up children, :P ) safer. I harbor only mild, 1 in 1 billion odds scenarios for concerns now, which means I'll shut up about this being a problem.