It's worth pointing out that quoting this list is a little disingenuous. Considering only items on the list starting in 2000, only a third (8) appear to have involved firearms.

Did you even read that list? That list only helps the point. We haven't had a public mass shooting in decades. The more recent incidents have been arson, car attacks, or murders of people known to eachother, and they have had significantly lower impacts.

Because it's true. Whatever bad things have happened since, their per capital gun death and murder rate have dropped.