Okay, so I found the problem, you're ignoring half of the definition for efficiency. Efficiency is the (often measurable) ability to avoid wasting materials, energy, efforts, money, and time in doing something or in producing a desired result. ... In general,efficiency is a measurable concept, quantitatively determined by the ratio of useful output to total input. In our scenario, the "desired result" is to kill as many people as possible, as is the goal of mass murderers. Therefore your rantings about clips and reloadings is completely pointless as has been proven over and over by many different shooters and knife attackers. By using a gun you can kill more people DESPITE having to reload, the weight, bulk, etc. That's why mass shooters always have higher body counts than knife attackers..... and which is why you can't respond to the question : Name one knife attacker who has killed more people than the Vegas or Pulse shooter. And this is why using a gun is both more efficient AND effective than a knife in a mass murder scenario. Now if you changed the scenario as to what is more efficient to assassinate one person, you may have a point. But in a mass murder scenario there is a ton of evidence against you. and counter edit: I didn't make this about guns vs knives, the gun nuts opposing a very basic fact did. Like you.