Cons- aside from cutting govt, how do we revive the economy?

We need a huge industrial economic engine. whether private corporations, or the govt doesn't I don't much care. We need new roads, transportation, rails, efficiency homes, clean energy, I don't care what it is, it needs to happen. Why not use our centralized government to orchestrate this instead of just cutting all our programs and hoping business will just solve it for everyone. By letting govt lead, we can be assured of a holistic approach.