That is not what the poster was getting at. Also, most Native Americans were killed by disease. Having a gun wouldn't really help, in that case, since disease can still spread regardless of whether or not the host is dead- I.e, you can't shoot smallpox do death. In fact, were you to do that, more people would get smallpox, because of bodily fluids getting everywhere. However, there are certainly cases where the opposite is true, where having a gun is useful.