.. but it is "normal"? It's been like that for years. America just doesn't fix "local" problems, even if they're on a huge scale. That's how Puerto Rico managed to be without electricity for three months. This is what you get when you have a party that believes government is inherently bad: you get a failed state.
How come other countries look so much better being on pretty much the same level of society and culture?
Who else can fix an issue on this scale? Or does it mean society needs to come to terms with it and accept it like some force of nature?
As to why it chooses to do that, it looks like the crime in Chicago isn't an issue that affects marginal voters. Or that crime is endemic all the way up in Illinois; four of the last eight governors have been jailed for corruption, and that appears to be a cross-party problem.
It took Federal prosecution to get Al Capone, after all.