Since about 1990, the crime rate has been steadily dropping, but part of that is that we're "returning" to the rates that existed before 1960 when they skyrocketed, seen here Is there any consensus on what caused such an increase?
I'm aware that this question has been asked before
But the responses are almost all deleted except for one person who answered a piggybacked question.
hi! not discouraging other responses here, but fyi, there was another related post that got a better discussion
Incidentally, there are a pile of interesting posts on urban decline if you're interested in more on that topic
see this one, which includes links to many others What led Detroit to the state it is in today?
and this most recent one Is this Redditor's "Best-Of" comment about the history of Detroit accurate?