Wait, so who do you think these people are? Preppers? Primitivists? The answer for both would be the same: that exerting democratic control over the instability of the economy and the unsustainability of consumption/production/pollution could be done through political participation. There's no reason to resign yourself to the fate that the rich are going to do what they did in the 1980s, 2000s, and now again here since 2016 or that the major industrial producers are going to continue pumping poison into the air, depleting resources for profit, and hastening climate change. You can vote against them. Or at the very least discontinue supporting political movements that actively exacerbate them.
That's not what he said. He said it was in preparation for the next crash: i.e. resigning ourselves to the fact that upwardly redistributive boom-and-bust economics and brutal post-crash austerity policy is the only option....despite the fact that we went 45 years without it up until 1980. Personally, I don't have a problem with eco-types pushing to destigmatize alternative protein-rich diets so long as it's not seen as a solution to the problem cited.
You're giving current democrats way to much credit. I'd like to believe Bernie is the real deal, and Warren has some common sense notions for the economy that are slightly old school (good) Democrat, but overall, your party has abandoned the American worker. Trump won via being the only one to directly talk about how bad all the outsourcing was for American workers; that was supposed to be democrats thing. It is really, really important that American companies that sell things to America, make things in America. It's like thee issue.
Step 1 for a healthy economy: At least minimum protections for workers that prevent those with leverage and undo influence from creating a third world work environment, and no real wealth redistribution through WORK. Better than minimum protections work better, as seen by what happened here when unions had some pull, and the middle class was created. Short sighted rich people pretended it was bad for them, but it wasn't.
Step 2: Wealth gets redistributed through jobs and production that benefits everybody.
Step 3: Manufacture and produce enough that you do not spend more than you make as a country. Have a trade surplus.
That is obviously over simplistic. But it's also true. China had so much trade surplus money floating around the last 25 years that their economy grew, as did an upper middle class, while still repressing the hell out of their workers. Now that's not how it generally works, or would work here, but when you're making so much money, there is just going to be some that falls into the hands of people. It doesn't "trickle down," but yeah.