Also some base-stealing going on in that article. It tries to use the Kent State shootings as a "disasterous" use of federal military forces, but this is very disingenuous. The Ohio Army National Guard was used at Kent State, and while it has its federal role, it is also of course a State force as well. The Mayor of Kent called on the Governor for help, and the Governor sent the Guard on his authority.
Having the military back up the cops when civil disorder breaks out has a long history in America. The key to not being worried about this is to NOT elect unAmericans to positions of power over the military, the IRS, the EPA, or any other part of the government. There is only so much you can do structurally with constitutions and laws; the real key, like with any organization, is to put good people in the right positions. America has failed miserable at this in the past two presidential elections.