I think there is some confusion in the comment thread of this post over the point I made that your view on Keynesianism has little to do with your political ideology.
To be a "Keynesian" all you really need is to think that liquidity preference is an important determinant of the interest rate, the level of effective demand is an important determinant of output and employment, that as a result of shifts in liquidity preference and effective demand the economy can be below full employment for extended periods of time, and that when the economy is below full employment, spending of any variety (including government spending, but also investment and consumption spending) can have a multiplier effect on output that is larger than it is during boom years.
That or a substantial subset of that is what it is to be "Keynesian".
If you have moral or philosophical reservations about the government taking action - any action - to respond to economic downturns, that's fine. Notice that nothing in that prior paragraph requires you to support government action.
If you think government is likely to bungle spending so badly that the inefficiencies and misallocation of government spending will swamp any spending mulitplier, then it's perfectly reasonable to be a Keynesian that expects the fiscal multiplier is small.
I personally rarely think about the size of government, I think government should be more active in some areas and less in others, and I think constitutional restraint of government, decentralization of power, and democratic decision making are essential. I don't want a large government, and I don't view government as having any special competence. None of that really informs what I think about macroeconomics - in fact it's entirely irrelevant to what I think about macroeconomics - but that philosophy of government in addition to my assessment of macroeconomics are of course going to both inform any sort of policy claim I advocate.