Been going on since '65, in case you weren't paying attention.
Second Vatican Council, aiming to modernize "the Church", replacing faith with humanism, which, no matter your beliefs, is by definition ante-Christum.
Glaring example, putting the altar in a central position so that the priest faces the congregation because oh it's so very unkind to offer the back to people. But turning 180 means you offer the back to the altar, which among other things contains the already consecrated host which for the believer IS the body and blood of Christ. It features also the crucifix but the anti-idolatry stance makes it irrelevant. Anyway the correct position was the old one
Altar w. hosts <-- Priest <-- People.
If you browse the mainstream media of the time, you will notice how it strongly pushed for the change, not really a good sign either.