Before we can postulate a realistic generalized conclusion, we need a sample size larger than 1. Right now the scientific, rational position on Fermi's paradox is that outside of Earth the universe is completely devoid of life.
That is one rational position, not THE rational position. I'd say it is the only empiricist position to take, but not all rational arguments are necessarily empiricist.
In 1980 was the scientific, rational position that outside of our own Solar System there were no more planets in the universe? I have a hard time calling that a rational position despite the lack of observed exoplanets at that date.