And it shouldn't "technically" be the way that it should be that a property homeowner is forcefully removed from their property.
> Why is that not a situation where they go okay, prove it, and he pulls up paperwork and such
I mean... I own my house and I'm not sure I could do this on the spot. Maybe I have a copy of some paperwork somewhere? But I can understand a police officer not wanting to learn to be a lawyer on the spot.
Before jumping to conclusions like this try calling your town office or county assessor to find out if that's something they can actually do, accurately and with current information, over the phone, 24/7. I already know the answer. The police do not act as prosecutors, legal researchers, or judges. The law protects squatters, unfortunately I agree. The police are law enforcers, not arbitrators or title insurance researchers.
In this case, working backwards from the arrest (and discounting most of the presented information as coming from the source of the arrestee and unfiltered by a known yellow journalism rag), I can hypothesize that the officer was presented with a situation where one individual was clearly resident in the property, and the other individual had attempted to force entry, was arguing with the cops about owning the property inhabited by the other individual, and refused to leave. Easiest solution to that problem for the cop is to take the individual who was invading the property and give him some time in the cool-off tank overnight until everything can get resolved.
On average that's the better solution. Imagine if the police were ripping you out of your home just because some lunatic showed up on your doorstep and started ranting that they owned your house. Playing the odds of perceived circumstance is likely to arrive at the best outcome here; the scenario where the angry invader is the legitimate property owner and the person resident in the building is the squatter is the rare scenario.
In this case, occupancy was 99% of the perceived law. One person was clearly established as resident in the property, the other one had just jumped a fence.
(Also, keep in mind that we're hearing the "drugs and prostitutes" claim from the property owner. This is the New York Post... They aren't going to fact check that claim).
The arrest itself was because police believed the squatters at first. The homeowner never actually did anything illegal in this case.