What kind of security concerns are there? What about the encryption of Signal?
I can see legal issues when discussing named individuals but figure that I could switch someone to emails or personal phone calls if in-depth discussions of a criminal neighbor were required.
My personal belief is that one’s security should all be internal, using personal symbols and language. No application is that secure. If someone can see your screen, it all goes out the window. I don’t really trust any messaging app or “secure” email.
Blueberry devices had a self-contained messaging that could be used just within the system - it was very useful to, for example, terror groups like “Occupy.”
And what if your network goes down? In such an event, your neighborhood watch would likely be faced with extra concerns about crime. So, using a simple code of flashlight or headlight flashes, walkie-talkie beeps, and other things should also be discussed.
Finally, if felons are wandering your neighborhood looking for things to get into and observe folks out on patrol, that’s not necessarily a bad thing.