Look up the origin of the term "banana republic" if you don't believe me. Or just look through how many things we did in South/Central America due to the doctrine of manifest destiny.
So if we have to do something bad to ensure a steady supply of oil at a reasonable price, sure. I can accept that.
But we should be discerning enough to figure out who to hire, and how to GET AWAY WITH IT to avoid repercussions. If you're the president, there's a lot more at stake here than your campaign - we're talking about full blown war.
I think that skill in shadiness is transferrable across motives. If you can't plan a robbery of a convenience store for your own wallet, why should I let you plan the robbery of a bank to give it all away to charity?
The ends (sorta) matter in a moralistic sort of way. But the means matter much more. You're playing for higher stakes here, not just criminal prosecution, but a low level brush war in the middle east if you mess things up.
aka robbing from the poor and giving to the rich