It’s probably worth pointing out that the writer of the letter had no problem with women learning computer programming to support their families. That skill is one that, presumably, they went to some sort of institution to learn.
So he’s clearly not saying that people should be uneducated/unskilled yet still hope to make a decent living.
Charlie:
It’s not a question of “the Torah educational system” and anyone being more “fragile” etc. Chazal tell us “Shani minus diMashcha”. Heresy has a specific attraction to anyone, even the greatest gadol.