*No* animals benefit by existing
Many appear to Goo, so what do you want people to think prevents them
benefitting as they appear to, and how do you want people to think it
Logic, here's one argument:
Two pigs exist, one has a good life provided by the farmer, Salatin, the
other has a life full of pain, suffering and deprivation provided by Tyson.
One pig benefits, the other suffers and is harmed, yet both exist in equal
Therefore existence itself is clearly not the source of benefit.