Your faith has always been what keeps you steady. It's not just a matter of believing in a higher power; it's about there being something true and beautiful in this world. Something that means you can endure the pain and the sacrifice, because there is good, and it is worth fighting for.

But now the world is ending. Around you, people are dying—and people are killing each other. Your faith spoke of an end times, yes, but surely it was never meant to be this cruel.

Trigger: When you've seen three solutions fail, regardless of who they were offered to.
ALTERNATIVELY, if two hours have passed and you still haven't hit this condition, instead trigger it at the very next thing that could justifiably make your character feel despair. (This can mean "immediately.")

Shatter. (click for more)

…You were wrong.
You were a fool, and you were wrong, and now you see the world as it truly is: defined by cruelty and (worse) indifference. And that higher power you clung to so fervently? Well, it's not that you don't believe in it any longer, but here, too, you at last see clearly: this destruction is always how it was meant to be. The highest principles, the greatest truths, demand that you place your faith in the ending that is coming for all of you, great and small. Maybe your companions still can't see that—so you'll have to make them see. It's the last kindness you can do for them.

The soldier, you think, is already at least halfway to understanding your point of view. So make sure they have the same epiphany you've had, and say these EXACT WORDS to them:
[Soldier name], you know exactly what I mean, don't you?
(Then, ping the player in discord to be sure they're aware.)