It seems to me, the question of whether 'war for oil' is justifiable is not the issue here. The issue is that war for oil is not what Congress & the American people were told we were signing up for. We thought we were going to put some WMDs out of commission, which would have been acceptable, even if it did sidetrack us from the search for Osama bin Laden, (which we thought was our primary objective, after 9-11), except there weren't any to be found - surprise! So then, our objective was to put Saddam Hussein out of business, and create a democracy in Iraq. Again, this would have been acceptable, had we not so many other crises to deal with: Osama was (& still is) hidden somewhere, plotting against us, and our own borders are unprotected, allowing so many illegals entry, we can't afford to send them back, and are being told that we must allow them to become citizens!
Our financial status is deplorable, with never enough money to keep up with our own needs, such as: roads & bridges, education, health care for the truly needy, sufficient oversight of food & drugs to prevent the recalls of food & drugs that have become a regular occurrence, (always & only after people are sickened, or dead). The Federal government keeps giving less to the states, who compensate by raising current 'fees' and instituting new ones, and the only people who can afford to run for election are the wealthy, who still need to raise millions for their campaigns. Raising that kind of money puts them in debt to those who can afford to donate big money: corporations, most often banded together into "Trade associations". Now, they have the clout to shape the laws to their benefit, and the 'working class' can ##### well live with it.
Corporations have become greedy to the point where they will ship jobs overseas, or south, or anywhere that permits them to improve the profits, even when they were profitable to begin with. Plenty of them use so many tax evasion loopholes, that they don't pay taxes at all, and many are subsidized with tax "incentives". (A company only has to say the magic word "jobs" to be handed the keys to the city/state treasury, but does anyone ever follow up, to see exactly how many, and what kind of jobs result? If so, I've never heard of it)
The one thing that every American requires, for the pursuit of life, liberty, and happiness, is gainful employment - without that, we cannot feel like productive citizens. As Maslow demonstrated, one cannot be concerned with luxuries, when essentials such as food
housing, transportation, and medical care take all our resources. In today's job environment, there are way too many working people in that situation: they have a job, but it doesn't pay enough to cover the necessities, much less saving for the future, or home ownership, or college for their kids, or even proper medical & dental care. (So much for The American Dream, eh?)
Considering the "State of the Union" since Bush took office, I don't think that deposing Saddam Hussein should have been very high on the priority list, and if the President thought so, why did he tell us, and Congress, that we were going to look for WMDs? Why are we so eager to 'help' other countries, when we haven't got the money to take care of our own, first?
How can we even think of being "Master of the Universe" when our own affairs are such a mess?