@curbmassa The overly obtuse part is that you forgot what enforcing a law means.
Remember, I bolded and italicized prevention. Enforcing a law is arresting a criminal who commits a crime. While there is no law against specifically “entering a school and murdering children” (because that would definitely be obtuse) there are laws against murder, and when someone commits a murder the police will investigate and if they can determine who committed it they will attempt to apprehend that person so they can be tried and, if convicted, placed into a penal institution.
All that other stuff is the crap they confused us with in grade school and in the action dramas on TV and in the movies. The good guys who save they day, the heros, the officer friendlies, all that stuff is great public relations but what a cop does is he arrests criminals.
