You’re right. While in a Wrangler forum, someone shared this interesting article of exactly why FCA has installed these security devices...Yeah, that's it as I understand it. Supposedly the FCA security module is there so that the OBD system can't be hacked into, maybe wirelessly. I'm sure it's a fortunate byproduct for dealers that it's that much more difficult for owners to use their own scan tool.

The Jeep Hackers Are Back to Prove Car Hacking Can Get Much Worse
After sparking a 1.4 million vehicle Chrysler recall, the security researchers offer a new lesson: It could have been---and could still be---much worse.
I thought this kind of stuff happened in movies!