This shows, there really is a gang problem in Southern California that seems deeper than almost anywhere else. Chicago apparently has a problem but it's obviously, not rooted in being able to go to Mexico on a daily basis.
This woman who moved to Texas from California complained how police helicopters with spotlights searching for gang members etc. could be seen in Southern California from time to time. Those are in that Sean Penn/Robert Duvall movie, "Colors" as well. That's pretty heavy stuff, I think I have seen that on the LA news as well. That's pretty disconcerting. That being said, wherever you have millions and millions of people living, it be NY, Florida, California, Texas, Illinois, you are going to see a fair amount of criminal activity.