To put it another way, Virginia Tech doesn't happen if Seung-Hui Cho is brandishing a sword. Columbine doesn't happen if Eric Harris and Dylan Klebold are wielding Louisville Sluggers. Charles Whitman doesn't kill 14 people at the University of Texas at Austin if he takes up his sniping position armed with a longbow.

Must not be familiar with swords, bats or long bows ...