There are far better ways, but we have neglected to avail ourselves of them, and typically do.

Sun Tzu teaches that combat is won or lost before it begins, and this is obvious upon reflection. Training, practice, preparation, logistics, etc., all determine who will win combat, regardless of the reason for the conflict or weapons used.

The fact that people are incompetent to avoid violence is demonstrated daily.

I do a lot of things to prevail in conflicts with killers who have sworn to kill me personally. The primary thing I do is to preclude combat.

All that being said, it has nothing to do with whether we have a right to defend our lives with the best means available, which is what the Second Amendment actually means.