Human beings are incredibly good at recognizing patterns. It is an amazing skill, both practically and creatively. But it can get us into trouble, too. And it is doing that now.
We observe ISIS’s horrific behavior and we see a pattern: A terrorist group bent on destroying our way of life. This pattern lends itself to certain assumptions. We assume that its propaganda accurately states its true motivations. We assume that anyone who supports ISIS must agree with all it says. These assumptions imply a purely military solution: Destroy the evildoers, wherever they are.