If you truly believe the handshake evidence is conclusive, (perhaps it is, perhaps we sometimes let willful blindness and common prejudice prevent us from seeing what's in front of our face) then could go by that judgment.
But there's far far more to go on than a handshake.
Jean Luc Maxence is an author for GOdF journals.
He recently wrote the foreward to a book by Father Celier, call "Benedict XVI and the Traditionalistsl"
The French government keeps files on everyone who has any religious or cultural role - ie, the freemasons keep files on them.
This was discussed by the former Grandmaster Alain Bauer in this article in
The Economist ( I believe there are Rothschilds on the board of the economist)
http://www.economist.com/node/12517185Let's put it this way: there can be NO DOUBT whatsoever that the Freemasons have actively conspired for the subversion of the SSPX from the very beginning.
You'd have to be crazy to think they haven't. Of course, since this is not common knowledge, most people won't know.
Most people in the SSPX are mainly concerned about their social position in the chapels and in the broader society, and being pro-Fellay is much more palatable to them, then facing the truth in the fidelity to their religion.