[ugh]

Nobody assumes that humans are any kind of pinnacle of evolution. I never said that, the submission never said that. There is a difference between “most life out there is probably microbes” and “all life except for life on Earth is microbes”.

It’s a wild guess (astrophysicists would take exception, however, with the assertion that they got the age of the universe wrong) but it’s also the best we have. And there is nothing wrong with that and it is not arrogance.