Where's the evidence that this solidarity ever existed? On the coasts at least, the people in this $300K range may talk a good talk about marginalized groups, etc, but the solidarity clearly ends at their pocketbooks.

Wealthier people skew Republican, and that's not just the 1%. OP's example of the school districts is another example. Still another is the fact that, if you look in any city in America, the wealthy (but not 1%er) areas have better roads, better parks, and better everything in terms of public infrastructure. I have a friend who works at the local power company who outright says that whenever there is a storm that takes out power, the wealthy areas come first for repairs, right after hospitals and police stations. Not, you know, the most populated areas or anything.

And it gets worse still, when the 20% try to redirect blame at the 1%. Because who are these 20%ers anyway? They're lawyers, managers, mid-level executives, financiers, maybe developers for banks, big ad firms, or VC-owned boondoggles. In short, they are the white-collar "hands" providing the services that allow the 1% to exert the level of control they do over the whole system.

To hear the 20% disclaim all responsibility for the state of inequality in the country is very similar to how the head of HR or IT tells you "well, I really can't do anything about anything, it's just Policy, set by our betters". But they are enabling all of it.