Yes, it is good to know that the police are taking it seriously.

While I'm not sure I'd confront someone late at night or in a deserted place, I have done so during the day. Just because someone throws litter doesn't necessarily follow that they'll carry a knife and stab me. I told a kid in Brixton last week to use the bin next time after he threw an empty bottle to the ground just in front of me. Me stopping to say it got a yeah whatever - but since another passerby (big bloke) stopped to agree, he did actually pick it up.

I reported two aggressive motorists last week too. One to his company for revving and inching forward while he was in the ASL surrounded by cyclists (while we were all waiting for a light to change) and then screaming abuse when we asked him not to do so and revving past us later; and one to the police for some really stupid driving (accelerating past multiple cars on the wrong side of the traffic islands with a blind bend coming up).

I do report good driving too though - just to balance it out.