None of the complaints have anything to do with California politics. They are all about growth. The problem here seems to be the local government is allowing unrestricted growth, and developers are jumping in to capitalize. But building high density housing WILL bring softer, less independent people who WILL be more left leaning than the more independent and conservative folks who reside in low density or rural housing.
It would not surprise me if the local government and developers use the tactic of declaring older/built out areas as blighted. This can lead to the government using eminent domain powers to make owners sell out and the developer move in. But wait, there’s more. Then the developer asks for tax breaks because they will be improving a blighted area. Usually such agreements involve something like promises of jobs for locals or donation of parkland or infrastructure improvements. Still the developer and the local government comes out ahead.