Kill blue cars because they are blue and evil and ofcourse to survive... and oh, the blue cars drops awesome power ups too... So theres no reason to not kill them!
Tired of being hunted by Man an asteroid decided to fight back and try to destroy the ships. Unfortunately, Man did not like an asteroid standing up for itself. If one asteroid was bad then the trillions of others were just as guilty. They must all be destroyed.
You are a peaceful asteroid. Defend yourself from the onslaught of Man.