FWIW: The targets at Fort Hood were soldiers, but predictably-disarmed soldiers. In the area Hasan attacked, the soldiers he shot at aren't allowed to carry weapons or even have them within easy reach. So it's more analogous to shooting up a bar frequented by soldiers that takes your weapons at the door.

Plus, his attack was intended to spread terror, not to achieve a military objective (any weakness he inflicted on the army capability itself was probably a secondary goal).