intrinsically evil

Fr. Euteneuer on principled voting:

Some ask if a Catholic may vote for someone whose policies would advance an agenda that is mostly in line with the Catholic Church's teaching? Also, what if the Catholic disagrees with the candidate's position on abortion but still wants to vote for this candidate for other reasons consistent with our values? Here the Church uses the term "proportionate reason" to indicate that there must be some kind of balance in the candidate's position that indicates it is likely that a greater good would be accomplished for society despite the evil he or she advocates. Proportionate reasoning usually has to do with positions that are not intrinsically evil in themselves or that, if they are, would constitute such a minimal part of the platform that they would be "outweighed" somehow in the grand scheme of the candidate's public service. According to the above principle, however, the degree to which the candidate would promote something as heinous as abortion can literally nullify all the other "good" that he or she would do for humanity! When the fundamental right to life is denied in society, all other rights and goods are therefore threatened. The very moral foundation of a people is eroded. So the answer has to be no, it is not legitimate to disagree on abortion and still vote for a radical abortion candidate.
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intrinsically evil: by its very constitution and essential nature contrary to the will of God.

United States Conference of Catholic Bishops:“There are some things we must never do, as individuals or as a society, because they are always incompatible with love of God and neighbor. Such actions are so deeply flawed that they are always opposed to the authentic good of persons. These are called `intrinsically evil’ actions. They must always be rejected and opposed and must never be supported or condoned. A prime example is the intentional taking of innocent human life, as in abortion and euthanasia. In our nation, `abortion and euthanasia have become preeminent threats to human dignity because they directly attack life itself, the most fundamental human good and the condition for all others’ (Living the Gospel of Life, no. 5). It is a mistake with grave moral consequences to treat the destruction of innocent human life merely as a matter of individual choice. A legal system that violates the basic right to life on the grounds of choice is fundamentally flawed…. The direct and intentional destruction of innocent human life from the moment of conception until natural death is always wrong and is not just one issue among many. It must always be opposed.” (Forming Consciences for Faithful Citizenship, Nos. 22 and 28, 2007)

John Paul II: “Disregard for the right to life, precisely because it leads to the killing of the person whom society exists to serve, is what most directly conflicts with the possibility of achieving the common good... It is impossible to further the common good without acknowledging and defending the right to life, upon which all the other inalienable rights of individuals are founded and from which they develop... ” (Evangelium Vitae, Nos. 72 and 101, 1995)

hat-tip to CatholicCulture