Peter Gibson, the guy who discovered non-celiac gluten sensitivity, retracted his own study a few years later, but it had already become a fad diet, so it just stuck. That being said, there have been some studies that seem to confirm its existence, but the evidence is pretty thin. (To be clear, celiac disease and wheat allergies are 100% proven and can be reliably tested for).
You really think this is over? Columbine was a shocking, once in a lifetime event when I was in middle school. By the time I was in college, school shootings were a fact of life. The only difference is that people weren’t rooting for school shooters. They may have caught this guy, but a new era of gun violence is just getting started.