Speaking only for areas near where I live, it was in response to a persistent uptick in home invasions. Police can't be everywhere at once, and LPR cameras flag stolen cars and mismatched plates that thieves like to use.

Harvest data and let the techno fascist state that is slowly emerging figure out a use case later. For potential scenarios: if you like sci fi you can watch minority report, if you like history you can look at central Europe around 1930