[carapace]

You would need to look into the history of the Bay Area going back to at least the 1960's, and probably one or two decades further.

It's more a case of counter-culture vs. mainstream; with the tech scene appearing Left-leaning only to the extent that the Right tries to portray their agenda as the mainstream in the media. (The Left does that too, it's just that the Right has been more successful since about the 80's when the pols roped in the Christians. Before then, Christians mostly stayed out of politics. Mostly. E.g. "liberal" becoming a "dirty word", etc.)

That's why you see e.g. Left-wing sentiment and Libertarian sentiment (as well as Furry sentiment; pro-gun sentiment; anti-gun sentiment; weird-sex sentiment; non-binary-gender sentiment; ... I could go on at length. CA is a weird place, and SF is the weirdest place in CA (except for Berkeley)) in SV. Really, it's a political and social kaleidoscope out here. If it looks Blue or Red it's the tinted filter.