The central tenet of what I tend to call either economics or Counter-demand-side economics–where the negation of a negation logically equals a positive–is that investors invest and employers employ. This is really a stretch for some, but that is the case in its nutshell.
The problem with Socialists–in a relatively free market at any rate–is that they want “rich” people to create new businesses and new jobs, and then they want to take their money. They want people to want to make money, then they want to be sure they don’t. They want the economic benefits of business expansion, but they don’t want anyone to benefit from it. This is quite literally the mindset of the child, but that is the level they operate at. You can’t not be stupid and ignorant of human nature, and still support these policies.
For their part, businesspeople are understandably reluctant to settle in for the night in a henhouse run by a pack of wolves.
This is the underlying purpose of the Keynseian “stimulus”: when you can’t get the people spending money who should be spending money–because you want to take it, and they know you want to take it–then you get government “investing” the money. You know, the “investor of last resort”, when all the actually competent businesspeople have headed for the hills, with justification.
This is where they get sneaky. They think that if they borrow the money, and if they enact “tax cuts”, that the economy will get moving, the businesspeople will jump back in and POOF, they have them caught. This is a bit like a six year old thinking that because he can catch his father in hide and seek that his father couldn’t escape him if he wanted to. It is infantile.
Sooner or later they realize this, and that is when they start arguing for a command economy, so the money will stay put for them to steal. If they get their way, as in Cuba and North Korea, the money gets spent, once, and after that the golden goose is dead. Maybe the bourgeoisie and capitalists are dead or in prison: they sure as hell are not creating jobs and economic growth. Mass poverty ensues.
Short of this, they put the jitters in everybody, and the nation as a consequence suffers.
There is literally nothing good in the doctrine of Leftism–except rhetorically–and much, much evil.
It is the doctrine of fools and the wicked.