[epistasis]

SF politics are extremely partisan, such that they get in the way of actually accomplishing anything. The factions are the (IMHO very poorly named) Moderates and Progressives. Once you've been identified as being on one side, even if you share common goals it's unlikely that there will be any collaboration, and very likely there will be extreme antagonism wherever possible. Political point scoring and blame games have superseded the goals that people say they support.