[PIF]

Not aliens, but the survivors of the previous civilizations.

[SunkenCiv]

Yup, much more likely imho.

[GingisK]

...survivors of the previous civilizations...

I am sure future generation will unearth our integrated circuits, and then proclaim that we just had to have outside ET help.

[Justa]

If you were a space faring species with incredibly powerful weapons would you tolerate a species of violent sapiens with nuclear weapons being able to travel the cosmos, including to your planet?

Or would you just blow up their atmosphere into outer space sending their planet’s evolution back 3 billion years?