It's the same reason people think crime is out of control everywhere, when it is lower than it has been a long time and continuing to decline. It's tied to the media you consume. Fear sells, so that's what you get pushed.
The murder rate in NYC is lower than in places like Jacksonville (Jacksonville also has a higher crime rate than Chicago)... but NYC and Chicago get used as examples of "out of control" murder. It's an easy story to sell and believe.