Absence of intelligent alien life and antinatalism

Please do hear me out.

Our universe is absent of intelligent visible life forms. It could mean that the universe in itself is sterile but for earth. or There could have been life forms, and as their intelligence peaked, they became aware of the suffering and the futility of life. And completely stopped procreating.

Once intelligence or conscious beings become aware of sufferings, then there is a high chance or probability that that species stops procreating. Resulting in the extinction of the species.

In earth too, we are seeing a lot of very old megaliths, that have to continuity in civilisation, they seem to be abandoned all of a sudden. Did sects of humans too achieve higher intelligence, but ended up non procreating and resulting in their extinction.