I was thinking that, too.  There are always a bunch of police cars parked around the Chinatown station, but I guess they're all inside where it's air conditioned.  Occasionally, you see a couple of them doing crosswalk jay walk duty.  Chinatown is a natural magnet for seniors who want to get produce and meats along with other traditional ethnic things at a cheaper price, so it's fertile "hunting" grounds for thieves.  We were just there on Saturday, too, but left before 1:00.  I'm wondering if it took place when the victims were somewhat alone walking down a street.  We try to stay in crowded areas, as much as I hate that.