Every galaxy needs many drains to keep the machine running properly.
Don’t get hung up on what happens to the information that is contained in the mass that gets sucked into the black hole.
Exploded megastars run the show.
Alien planets may look nothing like Earth. Ditto for alien life-forms. Also, they don’t have to be carbon-based, like us.
There could be alien items in our solar system.
Hundreds of alien worlds may have checked us out over the years.
UFOs are real, and the government knows it. Have humans developed them, or do they come from elsewhere? Are these current visits coming from faraway places, or were they parked here out of sight from long ago?
Alien abductions could be self-generated visuals within our minds.
Are there workarounds for exceeding the speed of light?
Are the UFOs that are currently here parked underground or underwater? Ditto for the pilots.
What are the workarounds for special and general relativity? Just because we don’t have any right now doesn’t mean other life forms also have none.