The movie was asinine, written by a person who doesn’t understand technology. My wife liked it. She doesn’t pay attention to the messages.
If you have a super-shuttle like the one shown, you don’t use it as a “bomber.” You have it loft a package (a damn big rock) into a suborbital trajectory. When it arrives at the target at a velocity of 3-5 miles per second, its “game over.” There’s nothing left but a big crater.
Likewise, you don’t’ have you chopper gunships flying around slowly in formation, you keep them fast, loose, and working in pairs.
Finally, if unobtainium is necessary for the survival of Earth, we’ll be back. And this time we’ll do the job from orbit... and make very, very sure its done right.
My best friend humorously founded the "Brown Earth Society" on the net. His motto? Earth First! We'll strip mine the other planets later.