I remember learning in Rabbi Falks sefer that immodesty is the cause of tragedy in the world(if someone wants i can try go through the whole sefer again to find where he quotes it)
And the gemorah says it is because of Am HaRatzus, like the statement above (see BB 8a). I doubt any Rav would have said something so ridiculous. And Rav Falk certainly does not say anything like this on page 382 of his book.
WIY: That is why women should be taught (Gemorah &) Halacha (not the fake stuff they teach in sems today). It has nothing to do with Tznius.