Statistics have been produced. They demonstrate that our perceived increase in crime is not really accurate - they suggest it has remained about the same or gone down.
IMHO publicity, liberalism - specifically lack of incarceration and/or early release of the wrongdoers (softer laws and/or 'easing' of penalties), plea bargaining that allows crimes to be downgraded to lesser degrees and lower penalties, and technicalities that are used by defense attorneys to eliminate very obvious FACTS from being considered are all part of the diminished crime 'statistics.'
Ignore the smoking gun and the bloody body on the ground, the finger prints (leftovers from last week). There is no 'reliable' witness to substantiate the facts so it isn't 'provable' that it happened at all.