I firmly believe that the world would be a better place had humans never come in to being.
However, we are here and we have done untold damage which we are now trying to rectify. We are the only species that can work collectively to save or wipe out another species worldwide, as far as I know. (Correct me if I'm wrong - I'd be very interested to hear of a species that has been eradicated by another animal species).
We are not the only species to abuse another, though. I have watched cats torment mice without killing them, seemingly just for fun.
We have all seen the David Attenborough film that shows killer whales 'playing' with seals before killing them. There may be a valid reason for them doing that but we can't know for sure.
I've watched cats drive dogs batty safe in the knowledge that dogs can't reach them.
'Birds of a feather flock together' and so do animals. Are we the only species that flocks not just with other people, but choose which groups and subsections of other people to flock with?