Well, basically it goes like this. First you say that the RCC will never change its teaching on morals. Then someone brings you some examples where the teaching has changed and you say it is a development, but not a change.
For torture, you can look it up in the New Catholic Encyclopedia yourself and see that Pope Innocent IV gave the green light to the use of torture and that it was practiced during the inquisition.
For slavery and the turnaround in Catholic teaching (or as you call it the development) see:
liberalslikechrist.org/Catholic/slavery.html
Or see the papal bull Romanus Pontifex:
Excerpt:
“We [therefore] weighing all and singular the premises with due meditation, and noting that since we had formerly by other letters of ours granted among other things free and ample faculty to the aforesaid King Alfonso – to invade, search out, capture, vanquish, and subdue all Saracens and pagans whatsoever, and other enemies of Christ wheresoever placed, and the kingdoms, dukedoms, principalities, dominions, possessions, and all movable and immovable goods whatsoever held and possessed by them and** to reduce their persons to perpetual slavery,** and to apply and appropriate to himself and his successors the kingdoms, dukedoms, counties, principalities, dominions, possessions, and goods, and to convert them to his and their use and profit – by having secured the said faculty, the said King Alfonso, or, by his authority, the aforesaid infante, justly and lawfully has acquired and possessed, and doth possess, these islands, lands, harbors, and seas, and they do of right belong and pertain to the said King Alfonso and his successors, nor without special license from King Alfonso and his successors themselves has any other even of the faithful of Christ been entitled hitherto, nor is he by any means now entitled lawfully to meddle therewith – in order that King Alfonso himself and his successors and the infante.may be able the more zealously to pursue and may pursue this most pious and noble work, and most worthy of perpetual remembrance (which, since the salvation of souls, increase of the faith, and overthrow of its enemies may be procured thereby, we regard as a work wherein the glory of God, and faith in Him, and His commonwealth, the Universal Church, are concerned) in proportion as they, having been relieved of all the greater obstacles, shall find themselves supported by us and by the Apostolic See with favors and graces – we, being very fully informed of all and singular the premises, do,
motu proprio, not at the instance of King Alfonso or the infante, or on the petition of any other offered to us on their behalf in respect to this matter, and after mature deliberation, by apostolic authority, and from certain knowledge, in the fullness of apostolic power, by the tenor of these presents decree and declare that the aforesaid letters of faculty (the tenor whereof we wish to be considered as inserted word for word in these presents, with all and singular the clauses therein contained) are extended to Ceuta and to the aforesaid and all other acquisitions whatsoever, even those acquired before the date of the said letters of faculty, and to all those provinces, islands, harbors, and seas whatsoever, which hereafter, in the name of the said King Alfonso and of his successors and of the infante, in those parts and the adjoining, and in the more distant and remote parts, can be acquired from the hands of infidels or pagans, and that they are comprehended under the said letters of faculty.”
