Excellent point. Crowd & riot control are a police function, not a military one. Hence, we have Posse Commitatus and other restrictions.
Plus, that Toast-a-Mob machine is pretty expensive. Maybe the manufacturer could rent it out to police departments whenever the Occupy crowd needs to be dispersed.
If or should they get or have one for their use, you can be assured, my FRiend, that the occupy crowd will not be the ones that it is used on/against. It will be us or pepole like us.