Had the government in the UK run a surplus prior to the financial crisis I suspect the case for a larger Keynesian response from the UK public would have been better received. That is afterall what Keynes originally proposed. Modern Keynesians have disproved it's necessity and yet... public opinion ultimately drives policy, perhaps Keynes requirement of running a surplus in the good times in order to run a deficit in the bad was more about satisfying the psychology of the general public than anything else.