The SSPX is a particular fraternity of priests. Fr. Somerville is cooperating with their work.
Are you attempting to compare their actions with flat-out schism?
I'm saying that these men and Fr. Haley all showed enough courage to renounce all earthly rewards and to choose the Truth over promotion and success. They would rather serve God in poverty and humiliation and suffer slander and persecution rather than to say that black is white.
So SOmerville did NOT join SSPX. Hmmmmm...
I would ask you 'why,' but you know the answer.
I applaud his work and his conversion, by the way. He did plenty of damage back in the 1970's.