Defense spending is our most effective form of economic stimulus. I'm always stunned when keynsian leftist retards rail against it.
As for farm subsidies, we sort of need to ensure a somewhat ready and consistent food supply, so yeah, we need it.
Welfare spending funnels mass amounts of money to Walmart, dollar general, Philip Morris, Tyson and other stuff leftists hate, and that amuses me. As noted in the OP it doesn't do anything to curtail poverty, and may cause more of it.