I think you ignore the class analysis - it is not so much a case moral probity or intellectual foresight - of people being angels - as of their objective interests being at variance.  Keynesians got away with bridging that divide so long as everybody could be a winner.  They could describe themselves as centrists then - whereas now, in the US, they are so far out liberals - you can't get a PhD in any University based on Keynesian ideas.

The political centre has moved so far to the right, that only the out and out class warriors are at the centre of it.  Basically the rich have been able to reverse the New Deal and re-assign the political system to themselves.  The problem is not with the economics, but with the realities of the political order, and only a political revolution can change that.

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