Post 5 last one:

Pope Pius XI's encyclical Casti Conubii states that society has the authority to inflict punishments upon its members, and even to deprive a criminal of his life, for the necessity of the common good:  (1) primarily, to vindicate the moral order and expiate the crime, (2) secondarily, to defend itself, (3) to deter other would-be offenders, and (4) to reform the criminal or deter future crime.

The notion that Capital Punishment is wrong is a modern construct, one which is divorced from the millennial teaching of the Church.  It isn't enlightened; it is simply progressive thought found in the expression of modernists, including popes, who are in fact rejecting Tradition.