> A war continuous until one side has caused the other more suffering than it can take.

The article is in large parts about how that's not true. It makes the point that the very existence of the Iranian regime hinges on its opposition to the US, to capitulate would mean for the leaders to lose all support, be overthrown and likely die: so there's no level of suffering that it "can't take anymore". And similar in the US, the leadership cannot survive politically to a capitulation. Hence endless escalation on both sides.