This question is taking a few extra steps beyond that, even.
Oh, sure, it's much more of a flight-of-fantasy question than a realistic one. An invitation to consider the tactical benefits of bombarding galaxies with black holes accelerated to a high fraction of c, maybe X-D
But the original impetus was the curiosity about the status of intelligent aliens for a FAI mathematically proven to be friendly to humans.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one.
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.