I live and am politically active in a
front-line municipality for these issues (Oak Park, IL --- the actual redlining bastion of the western suburbs, a 4.5 square mile gravity well for Cook County school funding so egregious it was one of the first examples in Johnny Harris's NYT "Blue States, You're The Problem video) and I'm telling you, straight out, leftist defenses of existing zoning rules are a very real thing. In fact, where I live, they are the
entire defense of those zoning rules: progressives have a supermajority of the board.
Leftists are not solely or distinctively responsible for exclusionary zoning and housing restriction in the US. Nationally, they're not even the biggest problem. But in many jurisdictions, places that should be the vanguards and test cases for housing reform, they are the controlling factor.
Which is why Derek Thompson addresses them so directly. What would be the point of aiming these criticisms at Republican-controlled municipalities? They don't share these values to begin with! They're not listening!
Right now, we have two parties actively propping up home values and the interests of the upper middle class. Klein and Thompson propose: what if on this issue we had two parties?