The Dayton individual should have not been left with a Swiss Army
Interesting you say this, because every so often you see news about deranged individuals say in China for example, where no one has guns, and so like you said they have to resort to knives, and here you really see the difference in the amount of carnage between the two scenarios.
In the scenario with a knife, the crazy person gets to kill maybe one person, before everybody else runs away or starts grabbing chairs and sticks to knock him out. A force multiplier such a gun, is a dif story