Why are libertarians always big conspiracy theory nuts?

Who believe in all this illuminati one world government crap and 9/11 conspiracy theories? Where is the evidence for these preposterous conclusions, no one wants a One World Government except for a couple of liberal nutters in the UN. Also where do they get this idea that we should abolish the Federal Reserve, are they stupid? How are we going to target interest rates and control monetary policy if we don't have a central bank? Every single developed nation in the world has a central bank, I think libertarians would rather just have people carry gold bullion, weighing scales and a saw around to the supermarkets when they want to buy food.