What Magister notes (citing a book by a professor of demography at the University of Padua) is that the problem did not suddenly appear out of nowhere in the 1960’s, but goes much further back. Priests were advised, when hearing confessions, not to ask questions. There was no preaching on contraception, so many of the laity were unaware of the moral issues involved and therefore did not consider it something that needed to be confessed in the sacrament of penance. As a result, it’s use became widespread among the Catholic population, even though it was never accepted by the Church.
The distance between Church teaching and the use of contraceptives continues to be perceived by most of the population as neither a sin nor a rebellion.
Even afterward – and this brings us up to today – the condemnation of contraceptives would be the subject of papal documents, but already at the level of the bishops it would hardly appear in preaching. The clergy, for their part, would be almost completely silent on it. And would continue to be very understanding and indulgent in the confessional.