Wait, an asteroid? Past asteroid defenses? Onto a colonized world? 

That's saying several things
A) Asteroids are not smart, and they are not easily used. They are giant chunks of rock and ore.
B) The AIF's asteroid defense system is crap
C) You just killed thousands of people, should it hit near any settlement
D) Where the hell did it even come from? The AIF can protect from an invasion of military-centered giant lizard-men warriors with better tech, but an asteroid can go right through their defenses?

I'm sorry, but the sheer stupid of the asteroid is horrible. You might as well just take the discs and toss them through atmo for all the good the asteroid would do. 

As well as the fact that it would be much better rp-wise if it were a distress beacon in several different Equestrian worlds, or in the Equestrian palace that my Supremes are looking through.