Animals wake up, find food, eat, sleep and wake up again. As per Atheism, humans are also supposed to have only that same purpose. If I believe in this life only, then as long as I can avoid conflict with material law, control legislation by funding political cronies and muster military and diplomatic strength, I can commit genocide, kill, steal, rob for 50 years of my life and the victims and society cannot do anything unless they gain same power and make me powerless and define a different standard of justice and ethics.