[SedVictaCatoni]

The whole notion of aliens visiting Earth is ridiculous. If there was a civilization out there so advanced that they could master interstellar travel, they would have no interest in visiting us - a hopelessly primitive society by their standards.

If there were a civilization out there so advanced that they could master interstellar travel, then we would be utterly unable to comprehend their motives for visiting us. The Hawaiians had no idea why Captain Cook had come there.

[Quix]

Conceivable in some cases and respects.

But doesn't cover remotely all the possibilities.

Or even near all the facts!