> If I had a choice, be born as a chicken (...) or not exist at all
Consider all the sperm or eggs you're "wasting" by waiting for the right moment to be a parent -- you are consciously choosing to not give life to many such entities.
Surely those entities, if they had the chance, would try to convince you to create them?
(My point is that this kind of "bad existence vs. no existence" thinking is rather absurd.)
