GAW, for that you should have quoted my last paragraph, instead. I don’t think you’re right, though. He was in America. Although people here had strong feelings for Israel, the Shita wouldn’t really separate them from the general society. For that he could have yelled more about secular education. Besides, saying that he invented a whole Shita out of thin air,a as a trick, is surely disrespectful. This is a large leap from what I said, that the organisation was Passul and he backed up the Psul with Lomdus.
HaLeiVi: The insularity of Satmar did not start in New York, but in Europe. Placing the extreme p’sul on the entire movement made it unable to enter the discussion.
The Shitta of Shalosh Shevuos is not “out of thin air”, but the emphasis on it is extreme. The Satmar Rov seems to have forced the Kefirah issue because he had no answer for the Rambam in Yad. However, once you call something “Kefirah”, it creates other consequences (which (I think) current day Satmar doesn’t hold of) that makes for an extremely insular community (for example, Eidus of a Kofer that something is Kosher may not be acceptable, so Satmar should not use the national Hashgachos).
As far as the Secular eductaion is concerned, the Satmar Rov (as well as others, including myself) believed that someone has to bring in money and work. Satmar is not into “secular education” similar to YU. They do believe that the husband should work and the wife take care of the children, similar to how Klal Yisroel has been doing it for hundreds of years.