In general democrats seem to be doing anything they can to make society worse in exchange for more votes.
Moreover, I don't blame people for NIMBY. A house is extremely expensive. It only makes sense to be conservative and protect that investment.
Not sure what the solution is, but I have found it very comfortable in smaller cities. Less commute and hassle than living in a big city, well worth the sacrifices.
My intuition is that the inutility of voting afforded by the left vs. right meme may be the end-goal for many reinforcing it, perhaps in support of those with the most money sloshing around in political spheres. If I intended to buy certain unpopular policy with political donations, I wouldn't want voters breaking out of their ideological silos and crossing party lines to oppose the candidates doing my bidding. Maybe that thinking is a bit too conspiratorial, though.
In some respect this is useful for the average person because there's just so much going on that being fully aware of the the different candidates stances on many different topics and trying to juggle all that is hard, and doing a good job of it in some cases is next to impossible. That said, it's taken advantage of in the extreme by politicians (of all groups) now, who seem to have purposefully divided the populace so they can rely on this. To all of our detriment.