Nothing I recall in the movie suggests it takes place in a "dystopian" world where civil rights and other tenets of Americanism has been curbed. Sure, Dtetroit is a hell-hole one step away from being razed in favor of a newer, better, city but that's hardly indicative of anything. Near as we can tell it's still by an large a "free" society with rights similar to the ones we actually have. Robocop even Mirandizes Boddicker when arresting him. How much of a dystopia with curbed civil rights can it be if things like Miranda Rights still exist? Near as we can tell aside from needing full tactical/riot gear policing still is carried out the same as it is today just with a greater edge of danger. Hell, Robocop's Prime Directives (Serve the Public Trust, Protect the Innocent, Uphold the Law) largely suggests the world is by and large "normal."
We get glimpses of the news media and other aspects of popular culture through commercials and TV shows and it doesn't seem all that different from what we actually had at the time and still have today.
So I'm not sure where the idea is that Robocop takes place in a dystopia beyond Detroit being a crime-ridden hell-hole which, well....
Feelings on present-day Detroit aside, in the movie it's clearly just a very dilapidated city with an overburdened and under-budgeted police force. As a city is it a dystopia? Ehhh.... sure. But that's hardly indicative of what the entire country our police forces around the nation are like.