LG, would you like to know something crazy about knives and firearms. I'm quite confident that as a 6'3" man with plenty of prior training, I can fight off multiple individuals at once if both myself and they are armed with K-Bars. Thus, if I wanted to go into a school and stab fifty children to death, I am quite confident I could do so, so long as all the resistance I will face is other individuals armed to an equal or lesser degree as myself. Now, I have no desire to kill anyone.
However, I am also quite confident that if I entered a school with a firearm intent on killing the same amount of kids, that others who are equally armed can shoot, deter, and kill me.
Why? A firearm is an equalizer, in fact, crazy as this sounds, it has been referred to as "The Great Equalizer". A knife, sword, epee, lance, pike, mace, bat, etc. is not an equalizer.