Toffler was right after all!
In general (I say this very cautiously) the recent crime decrease is because there are more unemployed males at home ready and willing to defend there homes and property and or give good descriptions that the Police can act on quickly. Criminals don't like defended targets and they don't like being identified. At the same time theft of copper from unguarded businesses has gone through the roof. Some crimes against persons (personal attacks) have gone up at least in my area.