Although I think ultimately the war was ended due to the atomic bombing, the Pacific just hastened their defeat, and allowed the Allies to move ground forces to the Home Islands. They were prepared for a bloody...bloodbath on their own soil.
When will people finally learn that the nukes were not the reason for the end of the war.
Japans economy was close to collapsing, they were close to running out of fuel for their ships and planes and they were already offering conditional surrender, with the only condition being allowed to keep the Emperor.
The nukes were completely unnecessary for anything other than showing the soviet union that they had them and that they had more than one.
As for surface-to-space missiles, I doubt they would be effective in FS2. Any missile with enough fuel and a strong enough engine to break the atmosphere, would have to be a certain size and that would make them big enough to be shot down by point defense. So unless you could fire a massive swarm of them, they'd never hit the target.
Maybe it would work if it was surface-launched SSMs, but I doubt anything, even something as "small" as an SSM missile (if I remember correctly, they are bigger than some fighters), can be launched from the surface of a planet.
But maybe the moon has a weak enough gravity well to be used as an SSM missile base, if the UEF ever uses their own version of this weapon.
Nope, it's not what they want. However, it's what they can do, and it's what they will do if pushed hard enough.
I don't think the GTVA can be pushed hard enough to resort to dropping asteriods on Earth, even if they are close to being pushed out of Sol. If word of that get's into GTVA space - and word of something of that magnitude WILL get through - they'll have full scale riots on the majority of their planets not to mention wide-spread mutiny in the fleet. They were only able to finish the portal project with the promis of a reunion. Genocide will be the death sentence (politically for sure, most likely also literally) to the current GTVA leadership. In the worst case it might even lead to a fracturing of the terran part of the GTVA, because the systems declare themselfs independent from the monster the GTVA has become.
And that's not even taking into account what kind of reaction you would get from the Vasudans, Vishnans and Shivans. Or what it would do to the other planets of the UEF.
Right now they only want the GTVA stopped. After such a massacre, they'd be out for blood. And not just a few troops, but pretty much every surviving person in the entire Solar System.
