What we saw after the 2008 was not real Keynesian Economics. This was Keynes: During a recession/depression do: 1. A reduction in interest rates (monetary policy), and 2. Government investment in infrastructure (fiscal policy). By reducing the interest rate at which the central bank lends money to commercial banks, the government sends a signal to commercial banks that they should do the same for their customers.

He didn't say: Prop up the banks, to big-to-fail, save Wall Street and screw main street. Apart from that he advized paying off debt when the economy is doing well. We haven't seen that for the last 40 years or so.