I remember that crime got a lot worse during and following the Viet Nam war - a normal occurance, as history and current events make clear. I also think population pressures and enormous immigration have aggravated the situation.
It's true that "many 'crimes' and resultant punishments never processed through lawyers and judges" - and that mostly resulted in great injustice (something you neglect to mention but are surely aware of).
And
There's an elephant in the room which everyone sees but pretends not to see - Race. A difficult subject. Liberals maximize its influence while conservatives minimize. But its influence is real and relevant.