From CatholicAnswers.com:

the use of arms must not produce evils and disorders graver than the evil to be eliminated. The power of modern means of destruction weighs very heavily in evaluating this condition.

If this condition is to be met, no nation could ever defend itself properly.  History shows that rolling over with little resistance–generally, though not always–will garner mercy and goodwill from the aggressor.  However, defense and war against the aggressor means violence which intensifies and escalates the longer the conflicted is protracted.  Rules of engagement get ignored, “human rights” become less important to each side, and the body count keeps rising.

War is hell.  Anytime a people decide to go to war they decide to multiply violence and death–that’s the only effective way to fight a war.  There is no such thing as a nice war, a pleasant war.  War is no time for picnics.  War is gruesome and bloody and produces evils and disorders even greater than the real prospective evil imposed by an aggressor.

No war is worth fighting if a nation is unwilling to escalate conflict to the point of inflicting destruction, pain, and death greater than what could possibly be inflicted upon itself.  That’s why this doctrine fails–in theory and, more importantly, in practice.

This is the purpose of war.

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