Why is the problem so high in SF and Oakland vs other CA cities?
Well, according to another poster, his local PD told him that an Oakland based gang is behind a lot of these types of crimes.
From seeing arrest reports all around the SF bay area showing people from Richmond/Oakland it seems this problem is "spilling" out of Oakland/Richmond into nearby cities.
I think the thieves have found that cars in tourist spots and large shopping mall parking lots are "juicier" targets with purses/backpacks containing travel money, laptops, etc.
Also, it is a repeated crime with the arrested being cited/released, and they go back out and do it again and again.
I think it went from being random "crimes of opportunity" to being organized and planned.
Also, I saw reports of international crime rings willing to buy bulk laptops / smart-phones and then ship them overseas, so there is a ready (black) market for all this stolen stuff.