Is humankind nasty?

Cyberneticist Warren McCulloch said: "I don't particularly like people, never have. Man to my mind is about the nastiest, most destructive of all the animals. I don't see any reason, if he can evolve machines that can have more fun that he himself can, why they shouldn't take over, enslave us, quite happily. They might have a lot more fun, invent better games than we ever did." Is McCulloch right?

Search terms:
 * criticism of humankind
 * is humankind evil

Pro

 * Humans exterminated a large number of biological species, especially mammals.
 * Humans greatly reduced the total biomass of the planet.
 * Humans invented and operated gas chambers in an industrial extermination of a group of humans.
 * Humans enslaved other humans, treating them as cattle that can be killed at will.
 * Humans performed medical experiments on other humans against their will, sometimes resulting in deaths of the experimental subjects.
 * Humans tortured other humans, deriving pleasure from inflicting pain on other humans.
 * Humans invented fissile and fusion nuclear weapons, threatening the existence and well-being not only of humankind but of other biological species.
 * Humans let animals held for food live in bad conditions, e.g. crowded places.
 * The human intraspecies aggression and killing manifested in wars has no analogue in the non-human biological realm.
 * Humans bring about a global climate change that runs the risk of greatly decreasing the habitalibity of the Earth for humans and for non-human species.
 * That is uncertain. It may be very hard to know these things.
 * Most humans would sooner die than they would start to think.
 * While not nice, perhaps not so bad as nasty.
 * Humans are compulsive liars/misrepresenters/truth distorters.
 * While not nice, perhaps not so bad as nasty.
 * Humans tend to believe in factually and ethically absurd propositions.
 * While not nice, perhaps not so bad as nasty.

Con

 * Unlike other species, humans take steps to preserve non-human species.
 * Too little too late. Since other species do not exterminate other species to the extent humans do, they do not then need to take steps to reduce the extermination.
 * Humans invented ethical and legal codes and succeeded to a considerable extent in implementing and administering them.
 * That does not help the exterminated species.