Well I can really only fathom two motives for this and the other beheadings that have happened in Iraq. One is that they wish to expel all presence of the U.S. and other allies from the region. The other is that they wish to draw us back into a conflict in that region. I tend to think that the motivations are the second. Radical groups like ISIS benefit enormously from a U.S. bombing campaign. The more people we kill over there, the more family members of those people ISIS can recruit. These people's willpower to continue this fight greatly outlasts the American public, who doesn't really want to continue a war that seems to have very little benefit to us. Also they have basically openly stated that they want American troops over there to kill. The often repeated slogan that we should fight them over there so we don't have to fight them over here is total bullshit. There is no way possible for ISIS to fight us over here aside from acts of terrorism. Soldiers on the ground do nothing to prevent terrorism, only sophisticated intelligence operations do. On the other hand it's way easier to kill Americans when we are over there than it is if we are over here. Invading based on emotional grounds is doing exactly what they want us to.
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