Consenting to something in order to avoid terrible costs does not invalidate the consent or remove the obligation it creates.

But it is not clear why Hume's argument is supposed to work. It sounds like the argument challenges the voluntariness of the consent. But this cannot be a conclusive argument here. After all, many people consent to things in order to avoid the terrible costs of not consenting. People consent to pay their insurance premiums in order not to end up without health care when the time comes that they need it. Promises made on the battlefield to lay down arms on the condition that the opponent will not