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I feel that necessity (in this case) is dictated by previous experience, current ability, and a realistic expectation of various options.
Least common denominator?
Necessary? No. Effective? Yes. In most situations, a firearm is simply risk mitigation in action. Least amount of me, most amount of target.
Ooo, QUICK! HORRIBLE COMPARISON:
We didn't need the A-bomb to end WW2 but I'm glad we used it.
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