What happened? We collectively over the course of time decided that the individual right not to be “harassed”, valid or not, overrides the ability to behave in such a manner. That happened because other officers proved they could not be trusted to exercise such power responsibly. “Being a nuisance” is a toe-length away from “harassing an ordinary citizen” when you don’t actually have proof. So, harassing a citizen to gain proof in order to prove it wasn’t harassment has an obvious problem.