Even putting aside the ethical and moral arguments, which carry a lot of weight for me: (1) There are network effects in urban environments. (2) Globally, specific industries often concentrate in specific cities. A lot of tech has concentrated in the Valley up to the San Francisco. The effects are getting stronger as that migration occurs. That's a great thing: it allows for people to move between companies easily, allows ideas to be shared, etc, etc.[1] That effects is and will continue to be hard to replicate elsewhere. (3) Destroying that seems like a gigantic waste. (4) We are destroying it through our current public policies -- housing and other. (5) I believe there are political solutions, just not ones that have been well-organized.
[1] Urbanism has a lot of other benefits too, if done right: like less traffic, and a lower per capita carbon footprint.