Reason just isn't the right approach. My wife and I actually have close friends who were in a normal cult. There's really not much you can do until they're open to thinking outside of the cult, which usually requires something internal to shake their faith a little. 

Undisciplined

Meta Econ Takeover Day 32

No surprise, we agree completely on that. I've found it particularly amusing to go through the exercise of asking statists why their favorite ABC XYZ federal department should be given expanded power or the benefit of the doubt when it's clear their policies have been ineffective. The contortions, mental gymnastics, and straw manning that ensues is hilarious.