Keynesianism is simply the idea that the people in power could avert crisis doing terrible things like printing money, which is what QE (quantitaive easing) and negative interest rates is.
Of course the people in power love to have all the power. Those people love taking automatically economic resources from you(and billions of other people) and doing things like traveling the world in their private jets fighting "climate change".
I personally know those guys. They believe you should not overpopulate the world having kids, and that you should always use public transport, while they use multiple mansions and private jets consuming more energy and generating more contaminating in a single move than thousands of families do in an entire year.
But they believe they are special and they could do it. Because they are luminaries.
Keynesianism is the dogma based in Keynes that justify, the 0.1 percent automatically taking 3 or 4 percent of the wealth of the world every single year in order to "save the world".
We have not lived yet the consequences of printing that much money. Debt has grown exponentially and this can't be sustained and it will stop.
This is propaganda for us letting them double down.