To the extent to which it holds true that beings who are both vulnerable and endowed with the freedom to do evil – conditio sine qua non of all ethics –, ethics must be an enterprise aiming at establishing which moral principles can permit us to ebb away with the minimum possible degree of suffering.
Every form of ethics which unreflectingly presupposes the continuing existence becomes thereby the accomplice of the Conditio in-/humana. Ethics, indeed, is committed in its basic intention to the furtherance of the cause of humanity. But any ethics which, in the face of human history up to the present day fails to see itself centrally confronted by the question of whether human beings have a moral right to procreate at all is blind and shares in the guilt for all the suffering that will be undergone in the future.
Ethics becomes unethical when it holds that there is no alternative for it but to have to appeal to the givenness of freedom in the cosmos as something positive. Because the freedom of acting subjects is always also the freedom to perform those bad and evil actions which were the reason why ethical principles were necessary in the first place.