Very evidently you can hypnotise the public to support mass murder, using the techniques they finally evolved. It has worked again and again, most prominently in driving support for invading Iraq.

As it was taught in other places in the world, we may guess that ISIS, FARC, and other movements learned to apply the methods for their own purposes. Anywhere you find ordinary people committing extreme atrocities, there are its (or its Soviet or Chinese counterparts') fingerprints.