If the problem is in our midst, we must acknowledge it.

Local boards in blue cities (California in particular) have blocked new housing for decades using every tool at their disposal. Places that lean left have anomalous rent growth. Places that lean left approve fewer new houses. Places that lean left have anomalously high building costs. This is a matter of written record. Embarrassingly, the only US city to buck this trend is Austin, a city in red-Texas known for a recent influx of radicalized right wingers.

> yuppies who want to defend their housing prices

Yuppies, but definition, are young professionals. They don't own houses, they rent. They are the ones paying the high rental costs as neighborhoods gentrify. They want more housing. The 35+ home owning population is the one that blocks new housing.

> I don't associate this position with leftism in any way

The leftist - YIMBY conflict shows up on 3 fronts.

First, Leftists have issues with the free-market. They reject market-housing solutions as a way to create new housing.

Second, Leftists like Govts and regulation. YIMBY wants less regulation, so they can maximize for space and price. Regulated Govt built housing is both more expensive and worse than what free markets already provide.

Third, and the most important, is a subtle accusation: "Leftists act just as selfish as everyone else, once they are the ones in power". Having come from an ex-socialist country, I have a deeply rooted belief in this accusation. Not that leftists are worse people, but that people are people, and systems should work around their imperfections rather than having expectations of ideological virtue.

The anti-trust left is a nice way to point a sub-section of the left which uses regulation, social outrage and critiques of free-market as a way to get personally beneficial outcomes, at the expense of the wider population. I understand - #NotAllLeftists. YIMBY & abundance advocates themselves have left-sympathies. But the anti-trust left is a non-trivial number and the conversation must start from acknowledging that they exist.