Old ammo or very poor quality ammo then. Modern ammo is generally lacquer sealed that the primer. Bringing up such an incredibly small chance mishap like that is specious logic. That would be equivalent to me countering your martial arts arguments by saying "Well, martial arts are useless because I might've broken the little finger on my right hand in rugby practice the day before, so I'd rather have a gun".
Same goes for jams, rare as heck in quality modern firearms using quality modern ammo. Straw Man arguments. Frankly, a gun is FAR more reliable than most martial art trainign given the spurious way most people are trained. You are taught to respond to set attacks that you know are coming, and the attacks are generally carried out in a totally unrealistic fashion. You then carry out a set of predetermined formulaic response that does not take into account the physiological responses that a real target will experience to the sequence of attacks. On top of this, you perform these maneuvers repetitively with ZERO FORCE behind the attacks, at minimal speed. In all, this type of 'training' is setting the student up with a completely incorrect mental picture of how an assault will occur and how even their own maneuvers will work in a real world conflict.
With a gun, I don't have to worry about how much force I am applying. I don't have to worry about the assailant attacking me in some manner that I have been trained to deal with. I draw said weapon and, 90% of the time, the assault ceases.
I am not saying that firearms are the only answer, simply that you are not pursuing your own line of argument objectively.
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