It all depends on your values. If killing millions to access their resources on your terms is morally ok with you, then it is worth it. If breaking the nation by imperial over reach disturbs you then it is not worth it. Only one politician or pundit has ever dared to say that empire is breaking us and that is Ron Paul. No, I won't vote for him. I admire his honesty but unfortunately he advocates dog eat dog economics as well. He is that rarity of rarities, a true believer.
If anyone is interested in studying up on our empire I suggest Chalmers Johnson's trilogy on the subject. It is not only detailed but an easy read. For those who don't value the facts I can think of many bumper stickers that will do the job.
In my opinion few Americans care about the morality involved. Most on the right will tell you that our government lies and is not to be trusted (true). They will tell you the government can't do anything right (true sometimes). The one time they will tell you that you are a traitor for not believing the government is when it is killing foreigners. Go figure.