It is helpful that Rav Nahman of Breslov was aware of the problem of Torah scholars that are demons-which is admittedly a problem, [Le.M. I:12, I:28.] and yet was able to see the importance of the Oral and Written Law.

Abuse does not cancel use. Abusus non tollit usum.

In fact in the very first of the 13 stories of Rav Nahman  is an instructive lesson.  The second to the King, was on a search for the kidnapped daughter of the king.  When he got to giants in a desert that told him to turn back. But he was stubborn and pressed on. You can say this is similar. 

 

 

 

 

 

Because the Torah says so

Thee are eleven ingredients of the incense in the holy Temple. The teaching that lists them mentions at the end that if they would had added a drop of honey, no one could resist [it would be so inspiring]. So why did they not add any honey?  כל שאור וכל דבש לא תקטירו No leaven nor any honey shalt you offer to the Lord your God.

This explains the simple path of the Gra. The Litvak yeshivot do not add nor subtract from the Torah because the Torah says so.  [And in fact that is actually a verse in Deuteronomy: Thou shalt not add nor subtract from the Law.]