Why God made not-so-brights

I'd been reading the New Yorker account of the right-wing activities of Supreme Court Justice Clarence Thomas and his same-thinking wife, Ginni. ["Partners," by Jeffrey Toobin, August 29.] Ginni does lots of "work" for conservative organizations funded by the money saved by the Bush tax cuts from taxation (and from uses mostly for the common good). Money protected now by the intransigent opposition to anything progressive.
    Right now, Mrs. Thomas's focus is said to be on "campaigning against the Obama Administration," in particular trying to bring down the President's healthcare legislation, on which the so-called Tea Party has attempted to hang the label "Obama Care."

But I digress. I only meant to identify what probably provoked a thought early this morning while I was waiting to press our coffee and pour.
    If God created the human race (or created the ancient Israelites, anyway) "in his own image," then why isn't everyone intelligent enough to see through self-serving political cant? Why isn't everyone bright?
    I guess God needed a few folks with somewhat lesser intelligence to make up the cant in the first place for the brights to see through and reject. And needed a lot of folks with even less intelligence to continue passively believing and supporting the cant so it would continually be there to exercise and test the brights, keep them sharp and God-like.
    God's awfully smart.