Well, we all know what happened in the twentieth century. Divorce got its toe in the door ... and within decades the door was wide open. Unnatural and disordered sexual practices corrupted Marriage. Fornication gradually ceased to be furtive and, after being 'Free love' in the 1930s, had by the end of the century become the natural assumption of Western societies. Homosexuals ... no; some homosexuals ... ceased to enjoy inhabiting an amusing subculture and became aggressive public ideologues. The mortal sin of missing Mass without good cause ceased to be a matter of guilt. You know all this, and much more.
My analysis, and suggestion, is this. Society has in effect regressed to the superficially christianised state it was in during the 'Dark Ages'. We are, in other words, in a new Dark Age of widespread unrepented mortal sin. In fact, ours is an even darker age, because people do not even accept that they are in a state of sin, and do not repent, not even once a year. Nor, probably, even when they die.
Unhappily, however, we have inherited the ecclesial sacramental culture, to which the reforms of S Pius X have led, in which it appears that a General Communion is the normal custom at every Mass. It is not commonly preceded by Confession; that sacrament has become so uncommon that, at the beginning of the Year of Faith, I heard (yes, I heard this with my own ears) one priest in a mainstream church, say this to his congregation: "I have decided to use the Year of Faith to revive confession. As you all know, in this church we have for long used the Confessional for storing what gets left unsold after a Parish bring and buy sale. It's pretty full, and we need to get rid of all the stuff so as to use the Confessional for confessions again. There are a lot of books ... I invite everyone to come and help themselves to any thing at all they can take away and use; and then we'll have a Work Party to clean it out."
So people who have not been to their duties for years receive Communion when, at family events, they have the rare experience of being at a celebration of Mass. People who have committed sexual sins for which they feel no repentance, which they have no intention to strive to avoid in future, naturally troop up to the Altar and receive Communion. As a product myself of Anglican culture, I am still horrified by the widespread Catholic custom of receiving communion into the hand and then walking nonchalantly away putting the Host into ones mouth as one walks.
The way ahead? Getting rid of the assumption that everybody always receves Communion. And a good start here would be the rooting out of an organised, military, Communion Procession in which a person actually has to make herself obvious if she declines to troop up to the altar.
Yes; only a first step; but some step has to be the first.