Bill is a liberal doofus.
The oil isn't evil, even the entire populations of the nations that have it are not evil. However the leaders of those nations are not well intentioned and Islamic State is even selling oil now.
Kill the bad guys. Boycotting their oil does not make them go away (especially with Russia, China, Europe, India, et al buying their oil).
We didn't have to kill off the entire nations of Japan or Germany to end the threat of retaliation.