On the contrary, they're often in the vanguard of those stoking these fires. Take for instance this quote from Bishop Richard Williamson of the SSPX:
"God puts in men's hands the "Protocols of the Sages of Sion" and the "Rakovsky Interview", if men want to know the truth, but few do."
Taken from Bishop Williamson's Letter Archive, May 2000
It's clear that this SSPX bishop considers the Protocols to be an excellent and reliable text. It's also seems quite likely that he has promoted this view, at least to some extent, within the Society.
Marshmallow's right...unfortunately some of the bishops in the SSPX haven't exactly been encouraging in this area. My wife almost walked out of a Williamson homily once for just this reason.
That having been said, I'd say that the way things are shaping up, the "mainstream" of traditionalism is fast becoming indults rather than the SSPX. So it behooves us "indult" traditionalists (and even SSPXers) to speak out a bit more against the wackos so that we're not all painted with the same brush.
I've got no beef with honest folks who differ with certain aspects of Jewish-Catholic relations. I know Ferrara for one is very critical of the Association of Hebrew Catholics. But it's way beyond that in some circles. When you start seeing the Protocols bandied about, you know you're in trouble.