Nice try, but Reagan's spending was for a purpose that government is actually supposed to be spending money on - defense of the country. He didn't tax and spend just so he could throw the money away on wasteful programs.
Yeah, America was really in trouble and desperately needed all that military spending at the time to pull through.
As far as what Reagan's job was supposed to be it was nice of him to go to ridiculously overboard lengths on the "provide for the common defense" part of his job yet warp the whole "insure domestic Tranquility", and "promote the general Welfare" parts of his job where he turned them into "benefit my cronies and a small elite number of people at the expense of everybody else".
It’s the government’s job to take car of the people, especially when they are the only ones that are big enough and have enough power to reasonably make sure that it gets done in a fair manner that helps everybody. It might be hard for people like you to admit, but there are a lot of things out there that are both important, big, and complicated enough (like health care for everybody, regulating and protecting people from big business, education, the military, fire departments, social security, ect…) that the only entity that can do it is the government. We don't live in a nineteenth century agrarian society anymore.