Where does evil come from?
It comes
from man
always from man
only from man
- Tadeusz Rozewicz
Alas, dear Tadeusz,
good nature and wicked man
are romantic inventions
you show us this way
the depth of your optimism
so let man exterminate
his own species
the innocent sunrise will illuminate
a liberated flora and fauna
where oak forests reclaim
the postindustrial wasteland
and the blood of a deer
torn asunder by a pack of wolves
is not seen by anyone
a hawk falls upon a hare
without witness
evil disappears from the world
and consciousness with it
Of course, dear Tadeusz,
evil (and good) comes from man.

Czeslaw Milosz

http://www.poemhunter.com/poem/unde-malum/