When it comes to big-money issues like housing, self-interest takes precedence over professed ideology. Ostensibly liberal California not only has rampant NIMBYism, but is also in contention for the most regressive property tax policies on Earth via Proposition 13.

Yeah Prop 13 passed when the state was much more republican leaning. Remember both Nixon and Reagan were from California and Schwarzenegger won the governor's race. Arguably the state only went democratic because anti immigrant efforts, particularly prop 187 in 94, pushed moderate latino and asian voters to vote democratic.

And yet they haven’t undone it, so the majority of the people actually in power must like it

There are costs to changing it, just like there are costs to rewriting an app in a new language. Only rewriting something from php to python 3 doesn't potentially leave senior citizens on fixed income homeless.

That doesn't mean people like it, or think it's not problematic, but there has to be an upgrade path that's viable.

Thank god people act rationally when it comes to their professed ideology

Moderates favor market-based solutions, progressives favor heavier government intervention (which NIMBY is).