My thoughts...there is no such thing as "knife vs. gun." There is only people trying to do violence (injure) other people. The person who is better at violence will always prevail. Tools don't matter, and the more time people spend on this handgun vs. that rifle vs. that knife vs. this martial art vs. that combat sport...the more they miss the point.
Focus on how to survive violent conflicts. You survive them by being better at violence than the other guy(s). Learn what real violent conflicts are like (hint, they aren't like bar fights or movies). You can learn about them by studying violent crime and prison violence (I don't recommend learning 1st hand
). Then learn what works best. The ones doing the violence successfully, what do they do? How could they have done it better i.e. more efficiently?
I was watching a show on gangs last night. The gang that won the prison gang war attacked 1st and stabbed their opponents until they stopped twitching. The gang that lost was reactive and perpetually behind the power curve despite a 4-5 to 1 superiority in numbers. When an attempted gang killing didn't work it was because they had horrible targeting skills (great aggression though). One guy was stabbed
53 times and didn't die (he even walked away under his own power to the infirmary). Lesson: Learn anatomy, one puncture to the aorta would have finished it, it's an easy target to hit as well. Anatomy knowledge will help a good citizen survive a violent encounter (using a knife or gun) just as much as it would help a gang-banger shank someone to death before the guards break it up.
Back to the "gun vs. knife" video...the inanimate objects have no bearing on the outcome of a conflict at that range. The "knife" holder demonstrated how fast distance can be closed. Once distance is closed humans can injure each other at will with hands, feet, rocks, sticks, and yes: firearms and edged weapons. The only advantage a firearm has is range. Of course, the guy holding the gun is by no means limited to just the gun and only using it as a gun. He could certainly injure the knife holder via pistol bludgeoning or a good 'ol fashioned punch to the throat. If he was good at doing violence, he wouldn't stand still either, he'd be eager to close and take the guy out knowing he didn't have the distance he needed for the gun.
1. Avoid conflict if able...it isn't worth it for ego.
2. If you can't do #1, injure the other guy until they are no longer a threat as efficiently as possible.
3. Feel free to carry tools such as knives and/or firearms to make #2 easier (more efficient if used properly) but they aren't strictly necessary.