Keynesian economics is a horrible system, but so far it works the best until we have another implemented
Keynesian economics is not science, it's just form of propaganda. You receive money from government to justify big government and call this economics, ecology etc.
So you mean the Keynesian economics is not exactly as what they said because they're under control of the goverment?
Well if your income are 100% depended on the government you wouldn't say anything to harm it. You don't bite the hand that feeds you. And that alone is enough to really be cautious about information coming from that source.
Also the only modern active alternative school is austrian and they are proven to predict things way better and they have a radically different approach(and the one that actually makes some logical sense).