I don't think that idea can go very far before running into serious problems. Gas taxes to pay for roads is straightforward, but what would taxing at point of use for "police interactions" even look like? Are you suggesting that police departments be funded entirely by traffic tickets and the like, or that every time you call 911 should add a toll to your phone bill? The conflicts of interest and other perverse incentives are rampant. What is the "point of use" for services like the military, whose whole purpose is to prevent ordinary citizens from having to directly participate in the national defense?