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In your example, virtually everybody died, even with fire arms.

So I still wonder against what / who you are really defending.

Needing a seat belt is much more likely than needing a fire arms, at least in Europe. Focusing on fire arms means focusing on the wrog things. It's about a feeling of security, not actual security. To use your wording: You'd give the world to have focussed on something else instead of buying a fire arm.