I don't trust the police either, but a two-foot-tall mobile camera with a top speed of less than 4MPH is not a slippery slope to sinister murderbots, any more than letting police drive cars is a slippery slope to them buying giant spiked steamrollers to crush homeless people with.
And at least the AUP prohibits "weaponization of the robot", so we should all be safe.
Either that, or departments have already asked for that, hence why it is called out.