I have a bit of an insight into SF/Cali tech culture. An old friend of mine works in a key industry player over there and is part of the whole environment.
I've noticed over the years that he echoes what we might see as a liberal left, anti-Trump mentality, but I've known him long enough to know he is as far from the realm of left-leaning pro-humanity as Albert Speer.
What he is, and from what I gather a lot of his colleagues also are, is an utter techhead. Everything is seen through the revolutionary prism of technology: society, race, religion etc. What is important is technology, rather than people. And there is a significant strain within that subculture that tacitly supports the vision of a technological distopia: a kind of neo-Soviet system of control where reality is governed by, and filtered through, electronic data.
In many ways, there isn't that much difference between these techheads and the hyper-capitalist finance subculture; it's just that one wants to make tech for tech's sake and the other wants to make money for money's sake. They think everyone else is pretty much subhuman and standing in the way of a "brave new world."
So when I look at the situation in SF, it makes sense with these attitudes in mind. People like my old friend don't see or give a shit about the homeless because they aren't "tech." Those homeless people, to them, belong to an old world that is about to be swept away and it's their own fault for not being "visionaries", and "this is what happens to buggy whip manufacturers".
Interestingly, my old friend also has a long-standing (about twenty-five years) obsession with the "man-machine interface", which, I suspect, plays into his ideas about transhumanism, which, in turn, influences ideas about trans-"anything".