
Sean, you ask, "Oh, and by the way, how does it make more sense to break up toxic chemicals in the atmosphere vs. a restricted area on the ground?"
Breaking it up in a location you determine is preferred over letting it land where it may and cleaning it up. If the sat had come down in a populated area, it would have done so with little warning, and the hydrazine, contained in a tank that might have survived reentry, could have poisoned a significant number of people. Bursting it high up in the atmosphere allowed it to disperse to safe concentrations, or maybe even be broken down into its chemical components by unfiltered sunlight, before hitting the surface in a location of the US Gov's choosing, in this case, well out to sea.
Skull and bones for poisonous content. Or perhaps I should have gone with the black helo for US Gov conspiracy to put some fish at risk?