Pope Benedict spoke in 2006 as to how Catholics should involve themselves in politics:
As far as the Catholic Church is concerned, the principal focus of her interventions in the public arena is the protection and promotion of the dignity of the person, and she is thereby consciously drawing particular attention to principles which are not negotiable. Among these the following emerge clearly today:
- protection of life in all its stages, from the first moment of conception until natural death;
- recognition and promotion of the natural structure of the family - as a union between a man and a woman based on marriage - and its defence from attempts to make it juridically equivalent to radically different forms of union which in reality harm it and contribute to its destabilization, obscuring its particular character and its irreplaceable social role;
- the protection of the right of parents to educate their children.
vatican.va/holy_father/benedict_xvi/speeches/2006/march/documents/hf_ben-xvi_spe_20060330_eu-parliamentarians_en.html
In 2007 Pope Benedict wrote in Sacramentum Caritatis of the ‘‘non negotiable’’ for a Christian involved in politics:
“respect for human life, its defense from conception to natural death, the family built upon marriage between a man and a woman, the freedom to educate one’s children and the promotion of the common good in all its forms.”
vatican.va/holy_father/benedict_xvi/apost_exhortations/documents/hf_ben-xvi_exh_20070222_sacramentum-caritatis_en.html
In a 2002 Doctrinal Note approved by Pope John Paul II called The Participation of Catholics in Political Life, Cardinal Ratzinger wrote “a well-formed Christian conscience does not permit one to vote for a political program or an individual law which contradicts the fundamental contents of faith and morals.”
He wrote:
When political activity comes up against moral principles that do not admit of exception, compromise or derogation, the Catholic commitment becomes more evident and laden with responsibility. In the face of fundamental and inalienable ethical demands, Christians must recognize that what is at stake is the essence of the moral law, which concerns the integral good of the human person. This is the case with laws concerning abortion and euthanasia (not to be confused with the decision to forgo extraordinary treatments, which is morally legitimate). Such laws must defend the basic right to life from conception to natural death. In the same way, it is necessary to recall the duty to respect and protect the rights of the human embryo. Analogously, the family needs to be safeguarded and promoted, based on monogamous marriage between a man and a woman, and protected in its unity and stability in the face of modern laws on divorce: in no way can other forms of cohabitation be placed on the same level as marriage, nor can they receive legal recognition as such. The same is true for the freedom of parents regarding the education of their children; it is an inalienable right recognized also by the Universal Declaration on Human Rights. In the same way, one must consider society’s protection of minors and freedom from modern forms of slavery (drug abuse and prostitution, for example). In addition, there is the right to religious freedom and the development of an economy that is at the service of the human person and of the common good, with respect for social justice, the principles of human solidarity and subsidiarity, according to which “the rights of all individuals, families, and organizations and their practical implementation must be acknowledged”. Finally, the question of peace must be mentioned. Certain pacifistic and ideological visions tend at times to secularize the value of peace, while, in other cases, there is the problem of summary ethical judgments which forget the complexity of the issues involved. Peace is always “the work of justice and the effect of charity”. It demands the absolute and radical rejection of violence and terrorism and requires a constant and vigilant commitment on the part of all political leaders.
Pope benedict wrote in 2004 to the Catholic Bishops on the topic of Catholic politicians communion the following, it basically says while Catholics can have differing opinions on capital punishment on waging are, but abortion and euthanasia are non negotiable issues.
He wrote:
While the Church exhorts civil authorities to seek peace, not war, and to exercise discretion and mercy in imposing punishment on criminals, it may still be permissible to take up arms to repel an aggressor or to have recourse to capital punishment,” he said. “There may be a legitimate diversity of opinion even among Catholics about waging war and applying the death penalty, but not however with regard to abortion and euthanasia,” he added.
lifesitenews.com/news/archive/ldn/2005/apr/050419a
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