So, San Francisco still votes 8% Republican. https://en.wikipedia.org/wiki/Politics_of_San_Francisco
Is it possible that there are a majority of people in SF that support changing their city and are Democrats? And, that a small minority of people (who could be Rs or Ds) can effectively block legislation to change housing laws? I'm not sure this article proves it is all "liberals" doing it, just that a) lots of liberals live in SF and b) SF has been ineffective at tackling the housing crisis ("...a place where lots of liberals live! QED!!!").
Having said this, my mom considers herself very liberal, and still has signs up on her lawn saying "Preserve Historic Houses" (which means "I don't support tearing down houses in my neighborhoods to build higher density places").
BUT: I do think she would be open to changing her mind. I'm not sure someone that lives in SF and that agrees with Trump's approach to immigration would be open to changing their mind. Is that biased of me?