Ultimately, the pairing of classical reward responses when hearing music with learning a smattering of music theory may indicate a brain mechanism for greater music appreciation. So what?
That's not "bypassing rational centers of the brain and creating a loop." It's simply "these people had a positive experience and there were ideas that were associated with that positive experience." If anything, the fact that brain regions which are active in moral reasoning were especially active in these people suggests the opposite of "bypassing rational centers."
You've conveniently ignored the actual data and results of their study entirely and instead taken a couple of speculative comments ("here's an idea, please fund us") out of context and twisted them.
The old baloney about religion being a primary cause of violence is a ridiculous urban legend. Ultimately you can trace the exaggerations back to centuries-old partisan tracts. Actual historians (e.g. Encyclopedia of Wars) find religiously motivated wars to be roughly 2% of the total death count.
If what you get out of the Shoah is that Hitler was right on both counts - Judaism is a disease, as is Christianity - there's something fundamentally wrong, not just with your understanding of history but with you.
The Inquisition killed about 3,000 people over the course of 350 years. (Secular courts, of course, killed people at a much faster rate.) For some perspective, the Great Leap Forward killed 30,000,000 people in 3 years.