ANTS go to global war. Murdering a significant amount of your rivals over territory is a completely normal animal thing. The fact that we are very good at it and invented explosives to do it "better" is just another feather in our cap that we have made ourselves "different". Hell, dolphins murder porpoises and launch them 50 ft into the air for shits and giggles and rape other dolphins when they are bored.

Philosophy is an invention of humans. Laws are an invention of humans. ETHICS are an invention of humans. Nature thinks our laughable attempts at "being ethical" are adorable. Nature is perfectly happy for us to brutally torture each other.