Many faithful, thoroughly orthodox Catholics will say things like this: “The SSPX needs to ‘return to the Church’ (i.e., regularize their canonical status) in order to help us fight from the inside. They don’t do any good on the outside.” Putting aside, for the moment, the mistake of thinking the SSPX is not already in the heart of the Church, the fact is that the SSPX would never be allowed to say things that need saying if they were under the control of the modernist hierarchy. Theirs is an indispensible voice at the present time.
Let’s take just one real world scenario, which I mentioned in an earlier comment. On April 8 in Saint Louis, the diocese recently co-sponsored a Jewish Seder meal, with prayers led by a local rabbi, purportedly to combat hunger. Catholics were encouraged to attend. Naturally, this kind of thing has long been forbidden by the Church, the danger of indifferentism for Catholics being rather obvious, and the negligence of permitting Jews to believe that the Church does not desire their conversion being still more scandalous. A good priest would warn his flock that they should not under any circumstances attend this event. But how likely is it that the bishop would tolerate one of his own priests, or even a priest of the traditionalist orders, publicly issuing such a warning? Such insubordination is naturally intolerable. Only the SSPX is in a position to act freely against this kind of scandal.
It’s wrong to say, as some in the Society occasionally do, that the Ecclesia Dei institutes cannot combat errors or fight for tradition. They can and they do, but on a different front. The work of these institutes is also very necessary. They teach and sanctify, reaching thousands who cannot be reached by the SSPX and who might have been lost otherwise. A congregation that has been well instructed by them already understands that attendance at the “interfaith Seder” would be scandalous. But these institutes cannot publicly oppose the bishop upon whose generosity they depend. The SSPX remains a necessary voice 25 years after the consecrations.