I may be going out on a limb here, but I suppose it's all a matter of degree to me. Yes, you can call it terrorism, but it did have a specific purpose and from their perspective, it was provoked. I would in no way compare that action to the 1972 Munich Massacre or the random Palestinian acts of violence targeted exclusively at civilians in order to promote terror.

In other words, is it still terrorism if the primary purpose is something other than the promotion of terror?