For those who suggest the police came up with this list, why do you think so?

Asking because I believe the Block Party organizers likely just handed a list to the NYPD instead of asking them for input.

Also, what is the expected training to NYPD street cops what is a RasPi or Flipper? Both come in all kinds of shapes, colors, and general appearance.

Far stretch, but this could be a subtle ploy to do get technologist (i.e., here) talk about this make it go viral.