>>531358713
>I'm fairly sure he was on earth doing research or whatever the fuck he's supposed to do
His mission was to capture a brain bug. That mission required a fresh offensive against the bugs, and the attack on Buenos Aires influenced the public to support the escalation of the conflict that fueled the fresh offensive. He has a motive. His powers and the think tank behind Games and Theory potentially provide the means.
We don't know the limits of his powers, but he was depicted being able to subliminally guide Rico to Carmen despite not being nearby. He also may have implanted a subconscious suggestion within Carmen's mind to deviate the battleship towards an intercept point that Games and Theory had calculated ahead of time with a known asteroid.
It is a bit of a tenuous theory, but it's more solid than the bugs making a trick shot off of a ship that wasn't supposed to be there.