Cain wasn’t a “rocket scientist”, he wasn’t a “scientist” in the literal sense.
He had a degree in mathematics, and a masters in computer science (my CS friends will be upset I deny them the “science” moniker when it’s in their degree, but I digress).
He was a ballistic anaylist, which means loosely he did trajectory stuff, how missiles would operate. He didn’t design and build missiles.
Not saying he isn’t a bright man, I’m just getting hypertechnical about the “rocket science” thing. Like when they used to say Carter was a nuclear engineer.