I also think you have absolutely no clue who international politics works by your blatant naivety. There's a lot more at stake than "access to oil". FYI Iraq showed oil reserves far superior to that of Saudi Arabia, and FYI Saudi Arabia has a military far exceeding most European states (UK, France and Germany obviously excluded due to the amount they do spend, but the Saudi Air force exceeds the UK for active combat air planes). Iraq with more money than Saudi Arabia and an intense hatred for the US/Europe would have been a massive fucking deal. Saudi Arabias royal family however is on good terms with the US government, and I'm sure the US didn't want a regional war between Iraq and Saudi Arabia locking down all Middle Eastern Oil production to ever be a possibility.
The War in Iraq was less about getting our hands on Iraqi oil, but getting their Regimes hands off of Iraqi oil. Had they been left alone since before the first gulf war, allowed to buy Russian hardware and build a military superior to that of Saudi Arabia, the region would be under their thumb and so would a massive chunk of the western worlds oil supply for military purposes. Not to mention they would have been well within the budget range to develop nuclear weapons without ever having to test like North Korea.
The US also didn't sit around and leave Europe high and dry in conflicts like the Kosovo War, because following your logic why should the US be dragged into a purely European conflict. Basically, because the US gives a shit about keeping its allies in place and stable and their enemies crippled and weak, which is what the rest of the world is trying to do too.
So when NATO countries have a vested interest in keeping a country down (Iraq) because it developing a military will support an old adversary (Russia), you can bet they'll tell the public whatever they fucking want to justify a situation like the Cold War never gets the opportunity to arise.
It's a sad state of affairs that crippling the development of foreign countries is in our own best interest, but personally I enjoy my way of life and the world isn't a John Lennon song.