Why Are There Kinds of Things That Must Never Be Done? Malum ex genere and the Entity of Human ActionThe paper is an outline of an argument in favour of a thesis of the classical ethics that there are some kinds of things like murder, including abortion and euthanasia that must never be done are absolutely forbidden; or that there are absolute and exceptionless negative moral norms. First, I show that moral properties like being morally good or bad, being obligatory or forbidden, are properties specific to some kind of entity which is human action; accordingly, the nature of moral properties is determined by ontological properties of human action. Then I present some of these ontological properties: the distinction of human actions from hum...