The shift in the US to the idea of “job creators” being business owners is part of it. It was just a way to direct money to the already rich, as if they would hire more people with that money. When it is plainly obvious that consumers are job creators, in that if they buy more goods and services, businesses will hire more people to make or provide more of those things.

Or maybe it was trickle down economics. Trickle up economics still end up with the rich getting the money since we all buy things from companies they own, it just goes through everyone else first. Trickle down cuts out the middleman, which unfortunately is all of us.

Because the entire western culture has shifted to instant gratification. Yes, what you suggest would most likely lead to increased business eventually. But they want better number this quarter, so they resort to the cheap tricks like financial engineering/layoffs to get an immediate boost.

Because government is always a fight about resources. More resources in the hands of common people and to make their lives better is less money in the hands of powerful corporations and individuals, be it in the form of higher taxes for the rich or less direct money going to their enterprises.

I'm not saying you are wrong that some redistribution can be good, but your analysis is simplistic and ignores many factors. You can just redistribute and then say 'well people will spend the money'. That's literally the 'Broken Window' fallacy from economics. You are ignoring that if you don't redistribute it, money also gets spend, just differently. Also, the central bank is targeting AD, so you're not actually increasing nominal income by redistributing.