No morally decent man wants ever to have to take a human life. But no manly man will be unprepared to defend against a lethal attack using lethal force, or hesitate to do so if and when circumstances require it.*  

The first proposition cannot be reasonably disputed; the second can. 

How might one dispute the second proposition?

I had a conversation with a hermit monk at a remote Benedictine monastery. I pointed out that the monastery was wide open to jihadis or any group bent on invasion and slaughter. He told me that if someone came to kill him, he would let himself be slaughtered. 

That attitude makes sense if Christianity is true. For on Christianity traditionally understood this world is a vanishing quantity of no ultimate consequence. (I used that very phrase, 'vanishing quantity,' in my conversation with the monk and he nodded in agreement.) Compared to eternity, this life in time is of no consequence. It is not nothing, but it is comparatively nothing, next-to-nothing.  Not nothing, because created by God out of nothing and redeemed by his Son.  But nonetheless of no ultimate value or consequence  compared to the eternal reality of the Unseen Order.

Socrates: "Better to suffer evil than to do evil." Christ: "Resist not the evildoer." Admittedly, "those who refuse to resist evil permit the wicked 'to do as much evil as they please' " — to quote from Hannah Arendt quoting Machiavelli. But again, why would this ultimately matter if the temporal is nothing as compared to the eternal?

But is Christianity true? We do not know one way or the other. Belief, even reasonable belief, is not knowledge.

If Christianity (or some similar otherworldly religion) isn't true, then he who allows himself to be slaughtered gives up his only life for an illusion. But not only that. By failing to resist the evildoer, the one who permits evil promotes evil, making it more likely that others will be violated in the only world there is.

What do I say? More important than what I say is how I live.  What people believe is best shown by how they live.  Talk is cheap and that includes avowals of belief. Belief itself, however, is demonstrated by action, and often exacts a cost.

Well then, how do I live? Monkish as I am, I do not spend all of my time in prayer, meditation, study, and writing. I also prepare for this-worldly evils that may or may not occur. I shoot my guns not just because I like doing so; my ultimate aim is to be prepared to kill malefactors should it prove necessary to do so to defend self, others, and civilization itself. That being said, I pray that I may die a virgin when it comes to taking a human life, even the life of an MS-13 savage or a Hamas terrorist. **

Now what kind of mixed attitude is that? Am I trying to have it both ways? If I really believe in the Unseen Order would I not allow myself to be slaughtered like the monk I mentioned?  To focus the question, suppose that my wife has died and that I have no commitments to anyone else. My situation would then be relevantly similar to the monk's.

If, in the hypothetical situation, I look to my worldly preservation, to the extent that I would use lethal force against  someone bent on killing me, does that not show that I don't really believe that this world is a vanishing  quantity, that the temporal order is of no consequence as compared to eternity? To repeat, real belief is evidenced by action and typically comes with a price.

I do believe, as my monkish way of life attests, that this world is vain and vanishing and of no ultimate concern to anyone who is spiritually awake, but I don't know that there is anything beyond it, and I would suspect anyone who said that he did know of engaging in metaphysical bluster. Which is better known or more reasonably believed: that this transient world despite its vanity is as real as it gets, or that the Unseen Order is real?  There are good arguments on both sides, but none settle the matter.  I say that the competing propositions are equally reasonably believed.  I believe, but do not know that God and the soul are real and so I believe but do not know that this passing scene is of no ultimate consequence (except insofar as our behavior here below affects our eternal destiny).  I also believe that I am morally justified in meeting a deadly attack with deadly force, a belief that is behaviorally attested by my prepping.

Both beliefs are justified, but only one is true. But I don't know which.  The belief-contents  cannot both be true, but the believings are both justified. And so it seems to me, at the present stage of reflection, that by distinguishing between belief-state and belief-content, a distinction we need to make in any case, I solve my problem.

But best to sidestep the practical dilemma by invocation of my maxim:

Avoid the near occasion of violent confrontation!

This will prove difficult in coming days as we slide into the abyss. But it ain't over 'til it's over. The slide is not inevitable.  If you know what's good for you, you will support Donald J. Trump for president.

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*When I counter a lethal attack with lethal force, my intention is not to kill the assailant; my intention is merely to stop his deadly attack. But to do so I must use such force as is necessary to stop him, force that I know has a high likelihood of killing him.  If my intention is to kill him, then I am in violation of both the moral and the positive law.

**Compare George Orwell, a volunteer for the Republican side in the Spanish Civil War: "Still, I did not shoot partly because of that detail about the trousers. I had come here to shoot at ‘Fascists’; but a man who is holding up his trousers isn’t a ‘Fascist’, he is visibly a fellow creature, similar to yourself, and you don’t feel like shooting at him."