Your still representing the police. you wouldn't want to give information to the public about crime looking like a paramedic?
since when do paramedics wear berets?
and i think what VPCdan was getting at, is that its all very good looking like the police while you are "representing" the police and "giving information", until an MOP mistakes you for a real police officer and wants you to deal with something/intervene in a potentially dangerous situation.
Especially at the olympics where we will have a sudden influx of visitors from all over the world who may not necessarily speak english as a first/second/third language or even at all; im sure you'd regret looking like a police officer when someone starts screaming at you in a foreign language you don't understand because he's just been a victim of [insert any crime you fancy] and they are getting agitated at the fact that you can't understand them (and of course they also can't understand "i'm a cadet, not a police officer").
but of course, as he pointed out, remarking on the silly combination of a beret and high vis is entirely different.