Mendelsson cultivated a perception of himself and acted the part accordingly.
We know now from his private letters (research by R’ Schwab) that the rot originated with him.
Even in his own terms, he was less Torah, more Kant
cf. Avos 1:3.
The Chasam Sofer saw right through it (which was an element in the detestation of him by the maskilim and the cynicism of their modox successors.)
“Shaul Lieberman?”
Revisionism
Eh?
“R’ Hutner tried to recruit him” to save him. He warned Lieberman that if he stays in JTS, he will be denounced on every possible occasion.
R’ Moshe Feinstein refused to grant recognition to his gittin.
(Then again R’ M. Feinstein wouldn’t recognize Rackman’s either)
Their personal observance nevertheless was more puntilious than some of the aforementioned names cited.
As aside, arch zionist Rabbi Shalom Gold, Rabbi Emeritus of Y.I. of Har Nof, told me personaly half a decade ago, that seruga wearing Elazar Stern is an unqualified “Rasha merusha”.
I can assume your desire to make the proof yet stronger.