Are you claiming that it has been revoked by JPII?
Given the circumstances, it would certainly have been within his power to do so. However, I agree with Cardinal Dulles, there was no need to do so. The present Catechism, which relies heavily on JPII’s encyclical, is wholly compatible with past teaching.
Someone accused me of being ‘sola catechism’, but you appear to be ‘sola fragment’, snippets of teachings with no context. The Church tells us this is not a proper or rational way to view our faith:
“The Christian faith is an integral unity, and thus it is incoherent to isolate some particular element to the detriment of the whole of Catholic doctrine.” Congregation of the Doctrine of the Faith, DN 2002
Perhaps you should have read the paragraph you quoted more carefully as the sentence immediately following the “protect and foster” statement is this:
*“This purpose is fulfilled when the legitimate authority of the State is exercised by taking the guilty lives of those who have taken innocent lives.”
*The Council of Trent says both that the purpose of the law is to protect and foster human life (as you claim) and that capital punishment fulfills the purpose of the law (as I claim).
Good, so we agree on the purpose. At the time (nearly 500 years ago), death sentences served the purpose. Now, although it is still theoretically permissible, the Church teaches that the purpose is better served by non lethal means:
“…authority will limit itself to such means, as these are more in keeping with the concrete conditions of the common good and are more in conformity to the dignity of the human person.” - CCC 2267
Again, we do not pursue a random collection of teachings, but a coherent whole. As we have already seen, an adjustment in best serving fundemental principles to suit current conditions is wholly within the Church’s provence:
“Finally, in order to serve the People of God as well as possible, in particular, by warning them of dangerous opinions which could lead to error, the Magisterium can intervene in questions under discussion which involve, in addition to solid principles, certain contingent and conjectural elements. It often only becomes possible with the passage of time to distinguish between what is necessary and what is contingent.”
vatican.va/roman_curia/congregations/cfaith/documents/rc_con_cfaith_doc_19900524_theologian-vocation_en.html
Your other argument, that the death penalty serves a necessary purpose of punishment, strikes me as dubious. As we have already seen, Ecc. Councils identify life as the central purpose of the law. This is true of the Council of Trent, the First Vatican Council, and the Second Vatican council. It is also stated by many Popes besides Pius XII (certainly every pope from Pius IX to present).
However, even if it is a valid argument, it seems moot. As then Cardinal Ratzinger noted, not all teachings carry equal weight and obligation.
"In effect the acknowledgment of the personal dignity of every human being demands the respect, the defence and the promotion of therights of the human person. It is a question of inherent, universal and inviolable rights. No one, no individual, no group, no authority, no State, can change-let alone eliminate-them because such rights find their source in God himself.
The inviolability of the person which is a reflection of the absolute inviolability of God, fínds its primary and fundamental expression in the inviolability of human life. Above all, the common outcry, which is justly made on behalf of human rights-for example, the right to health, to home, to work, to family, to culture- is false and illusory if the right to life, the most basic and fundamental right and the condition for all other personal rights, is not defended with maximum determination." CHRISTIFIDELES LAICI
Those words are John Paul II’s, but the teaching did not originate with him. We can find it in LUMEN GENTIUM, the dogmatic constitution of the Church from the Second Vatican Council. As you have noted, Pope Pius XII was exposing it more than a decade prior. And, of course, the Council of Trent identified it as the the purpose of law…