Ignoring the obvious joke about "random incidents" in schools regularly in America, is it not the case that the country with the most capacity to retaliate anywhere in the world would not be "demoralized"? I see the possibility that the effect of such terrorism might be different from place to place.
I'm not so sure. A school in the US being bombed would hardly be expected to demoralize us. Quite the opposite.
What if the goal was to goad them into taking action that could justify boots on the ground? But they didn't fall for it and here we are.