Don’t be so shocked. It was common advice back in the 70s and 80s. One former Pastor even did his thesis on why contraception was OK and he was totally in favour of it. After a conversation with him do you think I had any qualms about signing the consent for my husband’s vasectomy? Whole groups of us were advised back in university that if we had a good reason we could use the pill. Just what constituted a ‘good reason’ was left up to us. Do you think many of us looked further into the matter? Heck, no, a priest had told us it was OK.
I know that the encyclical is not an infallible dogmatic
definition, but Pope Paul VI in
Humanae Vitae taught against sterilization and contraception (other than NFP), in July 25, 1968, and Popes since the time of the Anglican Lambeth Conferance (1930) that condoned use of condoms. So the teaching is at least to be held as an ordinary teaching of the Magisterium.
vatican.va/holy_father/paul_vi/encyclicals/documents/hf_p-vi_enc_25071968_humanae-vitae_en.html
Since that time the laws in the USA changed dramatically:
1969 Byrne v Karelexis - private posession of obsenity is protected by 1st and 14th amendments
1972 Eisenstadt v Baird - right to distribute condoms to the married
1973 Roe v Wade - all the individual state bans on abortion during the first trimester become unconstitutional
1977 Carey v Population Services International - cannot prohibit sale of contraceptives to those under 16, …
1992 Planned Parenthood v. Casey - upheld the constitutional right to have an abortion
1996 DOMA marriage was explicitly defined in federal law as a union of one man and one woman
2003 US 558 Lawrence v Texas - same-sex sexual activity legalized