Any city is safe, and any city is dangerous depending on where you go. If you're in Chicago, and you go to the Austin neighborhood, or Englewood, then yeah, it's dangerous, but that's many miles away from any stadium that would be used, as well as where most people would choose to spend time when not at a DCI show.
Generalizing cities as safe or dangerous needs to be taken with a grain of salt. I've spent a great deal of time in St. Louis, Cleveland, Milwaukee, Indy, Chicago, etc. If you pay enough attention and do even the smallest amount of research it's easy to avoid areas that have high crime.
Simply stating a city is dangerous because of what's on the news or in documentaries doesn't paint a realistic picture.
For example: https://www.neighborhoodscout.com/blog/highest-murder-rate-cities-2018
On here, Chicago is in at #25, with 768 murders for 2,704,958. Hardly at the top. Elkhart, IN is actually higher per capita in murders.
It helps to put things into context before completing trashing certain place.
Last years top 12 are actually as follows:
1. East St. Louis, IL
3. Camden, NJ
4. St. Louis, MO
5. Gary, IN
6. West Memphis, AR
7. Baltimore, MD
8. Flint, MI
9. Detroit, MI
10. New Orleans, LA
11. Salisbury, NC
12 Danville, VA