There are public restrooms in every Starbucks (and please don't tell me there are not enough Starbucks in SF), it's their policy to let homeless and everyone else to use their restrooms without purchase. Not to mention actual public restrooms, restrooms in shops, parks, porta-potties etc. If there had been long lines of people trying to use those we could agree that there is not enough and we should open more. But it is not the case, is it?