If criminals are not prosecuted for crime, will that make crime statistics look better?

We are hearing that more and more AG's around the country, are decriminalizing crimes.

My theory is, they want the stats to look better in the future. If they don't arrest, or prosecute,
the crime rate statistics will ALWAYS look better, and the politicians in charge will be seen as
heros. Please note: this only only happening in Blue cities and states, with high crime.