I'd draw people's attention, in particular, to this principle:

> Whether the police are effective is not measured on the number of arrests, but on the lack of crime.

This is in contrast to the US, where a cop's career prospects largely depend on his arrest record. To see where this has led, read Arrest-Proof Yourself by Dale C. Carson.

(By the way, I don't actually live in the US, so if you want to tell me I'm an idiot and I don't know what I'm talking about I'll have no comeback.)