Q: Why is it that the human condition is a 'mixed picture'? A: Because that is the nature of the longaevus

The best die first - in the womb or as young children.
The worst are not incarnated.
The longaevus (you and I) are somewhere in between - the middling people.
Hence the world is mixed, a mixed picture - Good and evil - and it is hard to say which predominates, overall...