It’s not so much wealthy elites that are the problem here as everyday homeowners.

The problem is that in most of the neighborhoods that are consistently rejecting plans to build high density housing, the 'everyday homeowners' are the wealthy elites. As you note, they're people that bought houses when they were affordable in an area, and their home has appreciated in value to the point of being worth millions; that does make them millionaires in the classic sense (e.g., assets worth more than a million dollars on paper).

My town recently closed down a homeless shelter because they were afraid it was 'attracting' homeless people and would lead to drug problems. Which, yeah, that's true; it was pulling them into the homeless shelter instead of them living int he woods, out of sight. The homeless people are already here, and the drug problems (meth and opiates) are there too, they just can't see them. Opening a homeless shelter? Try that in a small town, amirite?