Ok, let's keep this on a non-personal level then. Other than your personal experiences, please give evidence that the SSPX is a cult.
There is a cult mentality that exists within the SSPX, and cultish behavior.
Manipulative, abusive, and hypocritical behavior, defended with unreasoning blind loyalty. A fundamental lack of consistency in the positions of the society and a lack of constancy. A certain clique now has nearly absolute power. And individual chapels tend to have favored families that try to "rule the roost" They are interested in remaining in favor with the society priests, and the Faith comes second to their concern about their social position.
The backyard radio trads did a broadcast on the sort of behavior you see at these chapels.
What I see is hypocrisy, intellectual dishonesty, and the lack of charity in the leadership, and a lot of fear of "making waves" among the followers.
And getting back to Bishop Williamson's comments - yes - there is definitely a liberalizing tendency that can be detected. It's unmistakable.