You bolded something, then answered it completely out of context. Yes they've killed many people. Yes that is a tragedy. Yes they are a problem that needs to be solved.
But in no way have they actually been a threat to any foreign nation in the time they have done so. The US, Western Europe, and even the Middle East are in no more danger of crumbling because of ISIS because of these attacks. We react with bombings and boots on the ground, more people despise us. More attacks occur when we infiltrate.
I'm not saying we need to pander to ISIS, but I am saying, like Buster, that they aren't an immediate threat like people believe. I don't have an answer for what the right course of action is against these terrorists, but blaming Obama, Islam, etc. isn't going to help any. We need a viable solution that isn't just, play world police and blow shit up.