I didn’t see anything about people being thrown out of the Cathedral for praying the rosary.
And I think there is a big difference between glorifying pro-abortion politicians—which I agree is wrong—and holding a joint prayer meeting with friendly people of different faiths.
I would, incidentally, draw the line at inviting Muslims to such a session, because I don’t think Islam is compatible with Christianity. But there is plenty in common among faithful Catholics, Protestants, and Jews. And what I used to say when I got together with Evangelicals is that we can agree to disagree on a number of points—but there is much that we hold in common. That makes it possible to work together, provided that you don’t push it too hard. I didn’t see any indication that that kind of false “ecumenism” was involved in this case.
So, Venerable Brethren, it is clear why this Apostolic See has never allowed its subjects to take part in the assemblies of non-Catholics: for the union of Christians can only be promoted by promoting the return to the one true Church of Christ of those who are separated from it, for in the past they have unhappily left it. Mortalium-Animos, Pope Pius XI