And Bp. Williamson told us one day, "Even if the N.O. ordination is valid, for the sake of the conscience of the faithful, the priest should accept conditional ordination from a valid bishop."
Yes, this.
Why not?
A) Because they want to be part of the conciliar church
B) Because they believe the NO Rite is valid when done by the book.
I fail to see how "B" is possible.
From 1991, Fr. Hesse, who should know, explains why it is valid, I think this should start at the right spot, might be off by a few seconds, but he goes over it in about 5 minutes or so.....
https://youtu.be/3QXDzzMo6WA?t=2949