He absolutely has a point. This comes back to the question of economics versus morals - the economic benefits of our relations with Saudi Arabia versus the moral costs of tolerating the message of intolerance that emerges from within it. The response to the SU-24 shoot-down this morning will be very interesting as you can argue that Erdogan's Turkey is another side of the same coin. I am probably not alone in thinking that our long-term interests align better with Russia than with the Sunni Muslim states - but admitting so would pose terribly difficult questions over Ukraine, etc, and would require tacit acceptance that Wahhabi Islam was at the root of the problem. Not very PC.
When you consider the complexity of the dilemma, you begin to see that the expedient solution is to bomb ISIL in to non-existence and defer the long-term resolution of the salafi-jihadist problem for another few years...