"Notice how many TV shows are about Law Enforcement these days?"
We've always had shows about law enforcement, what's changed is perspective from the 70/80's to the 90/2000's.
The former were about largely about innocent people accused of crime who got exonerated (Matlock, Murder She Wrote, Perry Mason, Diagnosis Murder) or plain old bad detectives (Get Smart, Inspector Gadget, The Pink Panther).
In the modern era, the cops always find the right bad guy who may get off due to technicalities (Cold Case, Law and Order, CIS, Special Victims Unit, 24, Cops).
When the cops are always moral and their accused guilty, our justice system eventually has laws passed to conform to our notions of pop culture.