Modernism
Shrug. Priests and bishops were educated and formed in "Traditional Catholicism", swore an oath against modernism ... and then proceeded to engage in sodomy, heresy, and infidelity. Then they went to Vatican II with malice aforethought ... that council wasn't hijacked, it was a disaster from the beginning.
Sodomy is a sin. Poverty is not. Sodomites is Roman Collars can be identified and defenestrated. "Traditional Catholicism" failed to do this in the XIX and XX Centuries. We must do better in the future. The "Traditional Catholicism" of Pius V (which you have referenced) is a better model than the "Traditional Catholicism" of the XIX and XX Centuries, which was an abject failure.
And yet like poverty, sin will always be with us. That's why Christ instituted the Sacrament of Confession; it wasn't on a temporary basis.
And now, we have a post-conciliar pope who says one does not even need to vocalize his sins in the confessional, if he's too embarresed, to be absolved.
No pre-conciliar pope ever proposed such a thing.
I'll be the first to admit, and also regret, that fact.
Do you know what? Our Lady asked for the Consecration of Russia be performed by 1960. It was never done. And guess what? John XXIII called for a council in 1959, and said council opened in 1962.
If Pope Pius XI had made the consecration of Russia in union with all the bishops of the Church, the following things would have resulted:
Pope Pius XI failed to make the consecration of Russia as requested by Our Lady. Great suffering resulted from this, for the world and for the Church. Sister Lucia said Our Lord spoke to her in an intimate communication, saying They did not wish to heed my request
they will repent and do it, but it will be late. Russia will already have spread her errors throughout the world, provoking wars and the persecution of the Church; the Holy Father will have much to suffer. The consecration would be made, eventually, but it would be too late to prevent the evils foretold by Our Lady if the consecration was not made in time.