You're right. Good website. I guess I will not return to Chicago for a very long time.
I even like the site's sponsor, Bad Idea T Shirts. Some of those shirts are hilarious.
The data at heyjackass.com point out that the violence is largely confined to a single population and is concentrated in a few neighborhoods. It rarely spills into the rest of the city.
Chicago is clean and safe in 90% of the remaining areas; the food, museums, parks and architecture are first class. It's an amazing city.