I don't think this is really accurate. There are many reasons that the people who live in SF might not love the number of homeless that are in the city, but I don't think most of them are thinking "That could be me any day now."

This is conflating two groups in SF: startup people and big company techies. The people who are driving up rents (and seem to be the focus of recent controversy) are the big company techies. I do not think that those people that work at Google are worried about being homeless any time soon. Similar for Facebook, Genentech, Apple, and other bus-providing companies. People working on startups full time may feel more at risk of being homeless, but I don't think that even they are actively worried about being homeless -- though everyone is different, so maybe some are.