Mostly nobody is against building more housing. The big issues, especially in California, are the Water supply issues. The cities largely run at capacity and the water system can't really handle the increased load. Then you have traffic and other safety concerns like electricity. It's not as simple as building more houses, it's a long road of improving infrastructure. I used to date a housing advocate who attended city hall hearings for a non profit, and no one objected, it would always get to close to being approved, then the water guy comes in and they can't do it.