Looks to me like Joel Kotkin has this one mostly nailed down:

Until just a few years ago, the need for economic growth to sustain societies was almost universally acknowledged. This was not just gospel on the free-market Right. Whatever its failings, 20th century socialism was growth-oriented and espoused the notion, however poorly realized, that greater material progress was critical to expanding working-class wealth.

Now political leaders in France, Iceland, as well as the European Commission increasingly believe, along with influential economists such as Joseph Stiglitz, that growing the economic pie should be supplanted by such goals as better health care, less inequality, and fighting climate change.

Many, particularly on the environmental Left, go even further and advocate “de-growth,” essentially urging societies to consciously reduce their economic wealth. This agenda requires that energy, housing, food, and other consumption costs steadily increase, or be legally prohibited, so that ordinary people will be unable to eat meat regularly, use more energy, live in larger spaces, and travel freely. There’s even a quaint notion that we need to return to a more primitive state of existence, essentially cancelling out the progress of the last few centuries. America’s Green Party, for example, would seek to limit long-distance trade entirely in favor of a feudal economy that is “largely self-sufficient in the production of its necessities.”

Even in the United States, where growth has long been an unquestioned priority, virtually none of the leading Democratic candidates for President even mentions the word. Vice-President Joe Biden, the leading “moderate” in the Democratic party primaries, has explicitly stated that he would wipe out fossil fuel employment in the country to pursue a green agenda.

The American Left’s abandonment of economic growth marks a dramatic shift from the approach of Bill Clinton, or even Barack Obama. In the 1990s, progressives still believed that economic growth was indispensable for improving the lives of the middle- and working-class families. Now, rather than seek to outperform the somewhat more robust economy and modest uptick in blue collar jobs under President Trump, progressives focus mostly on identity issues, environmental piety, and income redistribution.

Fundamentally abandoning growth means the effective end of the old social democratic program. Many self-defined socialists—typically academics and media personalities rather than industrial union leaders—reject the fundamental Marxian emphasis on “materialism” in favor of low growth “sustainability.”

The clue of course is that the people pushing for these destructive policies never seem to live within the restraints they want to place on everyone else. Witness for example the mansions occupied by Al Gore, Barack Obama, and Bernie Sanders.

the fact has always been that these people are about the destruction of the middle class. That’s why their policies always seem to end up with that destruction as a direct result.

the thing is, the working class has started to catch on to this including a lot of rank-and-file Democrats which in turn precisely explains the rise of people outside the political establishment of both parties, such as, but not limited to, Donald Trump.

Which in turn explains the resistance to anyone operating outside the political establishment. The rabid, foaming at the mouth attempt to remove a duly elected president for example.