It’s not just Cain’s lack of foreign policy knowledge:
“It’s not as though he’s a wonk on domestic policy, either. He’s tied himself in knots on abortion, contradicted himself on an electrified border fence, and demonstrated an unfamiliarity with basics of Medicare policy. Even on his signature issue, 9-9-9, he relies on repetition and assertion more than detailed argument.”
(from this article)
What I see in this article is a mix of legit concerns that also incorporates past dishonest attacks against Cain. Lowry is showing he has an underlying agenda by doing such.