Yes, I think what most people think of when they think of "squatters" in the US is a much different dispute over tenancy, not title. Most (all?) places in the US it is possible to be a legitimate tenant without any lease agreement, although I've found many people aren't aware of this. The term "squatter" is used for a broad spectrum of issues of tenancy, many of which aren't at all clear-cut. The current popular take on the issue might be that it's some kind of loophole or problem with the law which should be summarily handled, but the root of the issue is simply that cops aren't courts that can't perform complicated eviction proceedings, even if one party claims that the issue is simple (because it might not be).