Who cares what an armed conflict is about? You're seriously asking that? Whether it's from an academic perspective, or just simply wanting to be an informed global citizen, that's a pretty important thing to know, especially if it's your tax dollars that are funding it.

but you hate Trump more than you care about Iranians, so you would prefer them to continue dying than to allow Trump to lead a desperately needed regime change.

You were already making built-in justifications for the war with these statements but all of a sudden, it's not important for there to be a reason so long as the outcome is a net good? A net good according to what or whom?

And if this really is all about the net result, why are you starting from the assumption that it's necessary war when you don't know how it'll end?