Of course, in the case of a true doomsday situation, gold will also inflate - people will be desperate, and increasing amounts of gold required to get anywhere. Without a functioning economy, everything is scarce => expensive.

I have a gun. You have gold. Which do you think is more valuable?

Force trumps money, currency, and metal. In a true doomsday situation, the guy with the gun will always have more in the bank than the guy with the gold.

Yeah, but gold can buy you not only guns, but people with guns.

Using force to extort people usually ends badly, except for dictators at the top of the chain. You will never find security in weapons.

This isn't about using force to extort, this is about using force during an end-of-the-world situation.