Free concerts in Grant Park are good... and I'm sure the folks attending didn't kill anyone while they were attending... but I doubt Stevie Wonder's generosity had much of a long term effect. Incentives for gangs runs deeper...
Sure, I don’t doubt they went right back to their usual behavior once the show was over. Still, the savages at least showed a little respect for the man while he was there, which is more than they show for most.