  The problem of justifying war is also found in Greek thinkers, such as Plato, who argued in the Laws that war should only be waged for the sake of peace and that “it is peace in which each of us should spend most of his life and spend it best” (803d).  And in the Crito, Socrates considers the problem of whether it is ever justified to return evil for evil. Socrates begins with the assumption that we must do no harm; and he and Crito agree at one point that one “ought not retaliate or render evil for evil to anyone, whatever evil we may have suffered from him” (49d). It seems that this idea is behind Socrates decision to remain in prison and allow himself to be executed.