Other than informing and advising against methods that cause the death of the unborn - and the general respect for ALL life, what business is it of any church to mandate to its married couples what they can or cannot do in the privacy of their own marriage bed? The methods you mentioned were NOT abortifacient, were they?
The turn of the century brought changes in the needs of families. We went from an agrarian to an industrial society where large families were more difficult to provide for. The medical community responded to the need for parents to limit or control the number of children they brought into the world. Nobody intended that it would lead to increased promiscuity, adultery, prostitution or abortion. I don't think it was the intent to change the moral fabric of society or destroy the family. What started out as a helpful and needed benefit for civilization was perverted and twisted into what we have today. It has always been satan's design.
Did pre/extramarital sex, prostitution, adultery, abortion, child murder and abuse, exploitation of women exist before the "sexual revolution"? Yes, but these acts were not accepted by civilized society and were rightfully seen as negative, wrong and destructive to us all. Not very many people were aware that the "pill" had a back-up function of making the uterine wall incapable of attachment of an embryo - should one be fertilized. Most people - doctors included - were lead to believe that the pill only prevented a mature egg from being released and fertilized. That was how it was sold and why some churches did not object to women having that option. None of the "Protestant" churches approved of sex outside of marriage nor of abortion.
When the question is asked, "Did the Bible change in 1930, or did Protestantism?", the answer isn't so clear cut. First of all, the Bible didn't say anything about contraception. Outside of the Onan incident - which isn't a clear cut prohibition of "withdrawal" so much as disobedience to God's commands regarding a Jewish brother's responsibility to his deceased brother's widow - nothing is even close to talking about the subject. Again, nobody advocated for baby murder. That's why I think the question is disingenuous. Catholics have NO Apostolic tradition they can point to that proves them right on their prohibition of ALL methods of contraception. All they have is other people's ideas and opinions, but nothing regarding official teaching from the Apostles. We have their prohibition against sexual immorality, but not word one about married people and what they can or cannot do in the marriage bed.
Now, we can talk about doctrines that DO matter for a person's salvation and those that HAVE changed over the years in the Roman Catholic Church. Doctrines that some Protestant and Evangelical churches, for example, have never strayed from and which can be traced back directly to the Apostles because they are clearly taught in sacred Scripture. Did the Bible change or did Catholicism?