It's bo***cks. The old oil argument doesn't hold an ounce of water.
There was no embargo against Irak or Libya pre-war. That oil was fully and readily available on the worlds oil markets for anyone to buy. What do you think is cheaper: buying all the oil these countries can or could produce ever, or going to war for it?
You guessed right - buying it.
War is the most expensive and worst way to get your hands on oil. It doesn't make any financial sense. No, these wars were fought on idealistic grounds. Right or wrong can be argued, but that's another discussion.