Just so I am clear on some things...... If someone is under attack, it is acceptable to fight back by whatever means necessary.

Be it knife, sword, firearm, tank, attack helicopter, etc. Self defense is completely justified when under attack, am I right ??

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Pretzel · 61-69, M

were I can live you can use force to defend yourself.

if a reasonable person would find your situation to be life threatening you can even use deadly force.

pretty much the same rationale involving warfare - and if you're the winner in a conflict you can even use nuclear weapons.