Chicago and/or Cook County isn't particularly high on a per capita basis for violence. Generally the most violent places in the US are in the Southeast. (https://www.visualcapitalist.com/most-dangerous-cities-in-th...)

There are certain very specific parts of Chicago where violent crime rates are astronomical, but if you are worried about widespread violent crime, your best bet is to avoid the southern states.

Where did you learn that Chicago is so violent?