IMO the crime rates hard to measure. It could be there is less crime, or it could be someway they are counting etc etc.
In any event unless you want to blame the police when it gets worst you can't give them all the credit. I think it moves in cycles and sometimes police are powerless to stop it. They do have a tough job though, not bashing the police. Only I know some many of them, and they aren't all great people. It's hard to just give someone a bunch of credit because they have a uniform and a badge.
Still good news.