Crime up in city parks

I thought that the unleashed dogs were supposed to eliminate crime? This is from NY1:

NYPD Says Crime Is On The Rise In City Parks

Crime in city parks is on the rise, according to figured released by the NYPD Sunday.

The department looked at figures in 20 parks and found 68 crimes reported during the second quarter of the year. That's compared to 48 last year.

Thirty of the crimes were grand larcenies, or property that was taken when left unattended. There were no murders in the parks during that period, police say.

Flushing Meadows Park had the highest number of crimes, 21, followed by Prospect and Bronx Parks.

Crime citywide is down seven percent compared to 2006.