I live in Kalamazoo and know people both who survived and were killed in that attack. At least our community responded positively with new passing distance laws and broad community support.
ETA: I should mention that I got hit and run on my bicycle by a drunk driver years before the mass murder. My friends tracked down the driver, the police took statements, viewed the damage to the car exactly as I described it, driver matched the description my riding partner and I gave, and the prosecutor still declined to press charges. It wasn't a no-harm-no-foul thing either, I was pretty severely injured. Still pretty sore about that.
ETA: I should mention that I got hit and run on my bicycle by a drunk driver years before the mass murder. My friends tracked down the driver, the police took statements, viewed the damage to the car exactly as I described it, driver matched the description my riding partner and I gave, and the prosecutor still declined to press charges. It wasn't a no-harm-no-foul thing either, I was pretty severely injured. Still pretty sore about that.