I second that sentiment. My wife worked in downtown Detroit for the second half of the 1980s and we saw what the crack epidemic did to a city that had already been in decline for 20 years. A city with a population of about 1 million (at the time) averaged 500+ murders a year.
He may well have been in a position to know of corrupt police and city administrators, but only to try to save his own pathetic hide. I'd say 30 years in prison is only a small down payment on his debt to society.
Detroit is my hometown, but we left in the early sixties. My mom, now 96, describes Detroit of old as an entertainment mecca and a wonderful place to live. When I was a child there, though, all I remember is filthy streets, drunks on every corner and run down apartment buildings. My memories go back to late 50s, early sixties.