Remember how +Williamson used to teach that the 1950's were bad, with their APPARENT "everything is fine" sunny Catholicism? Even though the rot was there, barely under the surface, ready to break out in the 1960's with Vatican II and after that with the Novus Ordo Missae with all its abuses...
Many SSPX Catholics (and chapels) were living like it's the 1950's. Having their Sunday Catholicism, but the rest of their life was worldly, emotional, sentimental, and it wouldn't take much to take it all away from them.
The problem with recreating the 1950's, is that Vatican II happened only 10 years later! It's interesting that so much of the SSPX (especially St. Mary's) was like the 1950's, which is all many Trads are after. And now the fruits of the 1950's, once again, is the 1960's and a revolution to accept the Modern World.
Nothing new under the sun. History repeats itself, or at least it rhymes.