An alien civilization that has achieved FTL or let's say even a generational ship:
WTF would they give a damn about earth and be "buzzing" it in little ships like we would do with fighter planes? Imagine how advanced sensors would have to be to travel FTL and avoid destruction.
Why would they even be occupied by living creatures when we ourselves already use automated drones and interplanetary probes?
All our projections are from the limitations of our own technology and how we would deal with something. They aren't going to be that backwards/limited. And I think they would be very bored with earth, at best observe us like we observe primates and move on.