One of the things I teach is defensive tactics for cyclists.
About 10 years back a certain park in town had a terrible problem with robberies at night, people being robbed of phones, iPod, wallets etc. In the end I went to the Inspector and said id go out at night, stagger round pretending to be drunk, waving a mobile phone about, see which scumbag took the bait. Lurking in the shadows would be large burly officers with nicknames like The Swede, Pit Bull, etc, so I was pretty happy id be on the winning team.
My idea was knocked back because of "health and safety", yet to this day they don't bat an eyelid sending unarmed officers to offenders with knives, one officer I know being stabbed just last night. Let coppers do the coppering, and those who never could copper in the first place should just be sacked, not promoted to Inspector or above. That way scumbags like this would be quickly caught and dealt with.