This is true. A very ugly situation in what used to be a world-class city. I have seen homeless people defecating in the BART / Subway escalators.

Initial anger turned to apathy. Where would they go? There are no public toilets as far as I can tell, in the downtown / tenderloin area. I did volunteer work at San Quentin and Pelican Bay helping non-violent inmates apply for jobs outside, and almost all the ones I helped in San Quentin said they were being paroled into San Francisco. Eventually they all end up in the Tenderloin district, sleeping on the street and relieving themselves at the BART stations.