It appears we are starting to target the oil ISIL is selling to support there activities. I think that is a great start. I wonder though about our Arab partners & their motivation. Are the Saudi’s worried about the military threat, the cultural/religious threat, or is it all about the money? And we should apply that same question to the US and all the others that want in this fight.
Another possibility to consider, the Saudi’s have been exporting their extremists since the seventies. Might have been a smart policy at the time, encourage them to leave and be someone else’s problem. Now that problem is “coming home to roost”. (Tnks. Rev. Wright for the phrase)
Being a simple man, I think the simple answer is follow the money. It’s all about money and power. None of the players involved care about any of the lives lost or about to be risked. The current strategy of hitting hard targets insures a large number of these terrorists will fade and scatter. They will live to fight another day and the next battlefield may be closer to home than we will enjoy.