It's mostly people on the right who are saying "don't let this make you hate people, they are just trying to divide us, etc" as if that is not the exact thing we have been trying to aim for this whole time. Look where it has gotten us. Regardless of who Charlie's killer is or what their motive was, the left especially is beaming, excited over the moon that it happened. "They" aren't trying to divide us. We are already divided and that divide is going to keep on widening. No amount of just talking to people is going to help, clearly. We are past that point.
You can no longer just assume that these subhumans are friendly or just misguided. I did used to genuinely feel bad for people that had been brainwashed. Not anymore. If they think it would be fine that I were killed because I'm not in lockstep with everything they believe, then I no longer feel any kind of sympathy for them when violence inevitably affects them too.
There is no "fixing the divide" if only one side is attempting it, so there is absolutely no point in trying.