I guess some people in the other forums are trying to make Chicago as intimidating as possible.
This is for your own protection. At almost all major colleges and universities in Chicago, all entering freshmen are given a lecture on what not to do in the City and where not to go. These are primarily freshman from the suburbs, rural areas of the Midwest and all international students.
The academic community wants to keep their students safe and prevent them from being murdered, robbed or raped. Some kids think none of the latter will ever happened to them. But it still does. One little example took place at South Chicago ( on the SouthSide) Community Hospital, when a man named Richard Speck entered the Hospital living quarters one day in a hot, very hot Summer and murdered several student nurses. The ones who survived this ordeal did so by hiding under their beds, while the killings progressed.
I could give many, many other examples but I won't. You can research Crime in Chicago via Google.