The US has always been there. Via the US dollar as the Oil Bourse money. By overthrowing Mossadegh in 1953, supporting Hosni Mubarak, the Saud family, the Kuwaiti royal family, Reza Sha, and other dictatorships.
The US has publicly supported these dictatorships in order to provide and maintain stability.
So you agree it is because of stability
The terrorists are in Iraq because the US invaded. Oil production out of Iraq has not increased.
It has increased since the invasion, and yes it may not ever be to full production and I agree it doesn't matter as demand is greater than the output The amount of oil production from the reserves in Iraq would not be enough to quell demand and keep oil prices low, even if there was full capacity of output. And there won't be full capacity of output for years and year - if - it ever does happen - because of the security and turmoil.
Oil will not stop flowing. Oil will continue to flow. But it will be the type of oil that is more expensive to extract, and takes longer to tap into. maybe not stop flowing completely, but maybe enough that we stand in lines for hours one day a week to get our ration
You are using circular thinking, IMO. No offense.