Some of Father Feeney's followers were asked to "understand" the Holy Office letter as opposed to "accepting" it. The Holy Office letter nowhere states that it is de fide that there are individuals, since the Law of Baptism became obligatory, who are in Paradise and who lack that Sacrament. But, "Time & Eternity" will tell, and so, we agree, it is somewhat pointless to argue about this issue.
Here's the true beef:
The post-conciliar "Church" is not interested in converting non-Catholics to the One True Faith.
That's why they hate Traditionalists, and "Feeneyites", in particular. Honestly, I don't know what many of them believe. I think that most of them are like mainline Protestant denominations (Methodist, Espiocoplan, etc.), and they are into this, "All rivers flow to the same sea, All paths lead up the same mountain"-type indifferentism, and so they see no need to convert non-Catholics to the One True Faith, which is Roman Catholicism; as long as one has "fidelity to one's conscience," one can be saved, "at least by desire." I think that is what Karl Rahner taught and believed.
For them, dialogue with traditional Catholics is just another form of "ecuмenism," and as traditional Catholics ("Feeneyites" included) are opposed to the type of ecuмenism which does not at least desire that non-Catholics convert to the True Faith, the modernists do not like us. In addition, I think that we plant "seeds of doubt" in their de facto atheistic brains ("What if the Traditionalists are right?!"), because their theology simply does not make sense, is full of contradictions, logical fallacies, etc.