"Obama at UN: The only thing ISIS killers understand is force"

See, e.g., here. Let's grant force is appropriate. To be clear, far from sure what is being done is a great idea. Still not a fan of that line -- seems to dehumanize and is too bloodthirsty. The answer long term is at least force +. We deal with "killers" from time to time and realize this. Think Obama does too, but bloodthirsty seems timely.