They really do have a static view of the world don't they? For all their self-believed propaganda about how they're the nuanced, dynamic, outside-the-box thinkers, they have a shockingly simplistic and limited view of human existence.
Why not just make everyone a millionaire? Now we're all rich! Does that mean we'll all have a mansion and a Ferrari now? Or does it mean a Big Mac and fries is now $5,000?
What they just can't accept is the axiom that value is based on scarcity. This isn't even from human economics, this is from biology. If your only skills are basic physical labor, well you have a needed and important skill but you're going to find yourself in the company of lots and lots of other people. You're not going to command as much compensation from people who purchase your skills as would someone who knows how to successfully remove a brain tumor.
Why are they so stupid? It almost goes beyond mere stupidity. It's really as much arrogance as anything...the belief that through sheer force of will and moral grandstanding they can somehow alter reality to their preference. And from there it's a short hop and skip to liquidating people who are "preventing it from happening" and "sabotaging progress".