I imagine people here have a very wide range of opinions of "the police" -- and an equally wide range of personal experiences with them. A statement that they "don't know the law" and "make things up" is over-broad, not provable, and veering awfully close to a couple of things that are discouraged on this forum: (1) politics and (2) denigrating whole groups of people.
Encouraging people to "drop horror stories" has a strong Us-vs-Them vibe to it. In practice, it tends to make people feel more powerless, not less. Instead, how about a focus on what exactly you think needs to change and how people could work towards that?
Since this is, after all, USA/Planet Earth, there's never a shortage of horror stories. It is notoriously difficult for small social groups to accomplish their aims in isolation -- especially if they present their specialized grievances as the main/only priority. Maybe a broader sense of shared concerns with other people would lead to more practical ways to move forward.
Also, it's not unusual for a community to try to protect itself, in both heThealthy and unhealthy ways. Something you despise enough to refer to as Babylon and energetically isolate yourself from is not likely to welcome you with open arms when you decide it's more convenient for you to temporarily access it again.
A stronger focus on concrete goals -- and positive action steps to get there -- might have a greater chance of success. So would greater awareness that we are all in this together.
PS
I didn't quite understand why, if you were staying in a hotel, you considered action aimed at your vehicle to be aimed at a vandweller.
And I wonder (it is a neutral question, not an insinuation -- I don't know the answer) whether your vehicle in some way stood out from other vehicles with hotel permits. If not, then what is it that you believe attracted police attention to it?