Unless consent is forced.
Foreign intervention abroad is not in our constitution. Thus I don't consent voluntarily to supporting such a war effort.
And by the way, altruism is a fraud. I'm surprised that you seek to legitimize it. Even Rand doesn't do that.
I don't see a more equitable mechanism of consent in matters of national interest than majoritarian consent at election time. Do you?
About altruist foreign policy, I agree with Rand. Altruistic intervention is rightful with respect to the nation that is intervened when that nation is ruled by a government that usurped power. It is rightful with respect to us citizens if it is justified by the national interest. It is rightful as long as the government can present a plausible case for the national interest. If that case is falty, then the nation, being a free nation, would vote the government out of office. Till then -- till the election time -- the citizens may agitate against the foreign policy, but they may not legally withhold consent.
I'll probably re-post this, with modifications, on the other thread, where LSJohn should see it.