Last Saturday, my stepdaughter graduated from the University of Missouri’s honors program. As I listened to the commencement speaker extol the virtues of being flexible and taking risks, I thought about the annual kerfuffles surrounding some higher education institute’s decision to invite — and sometimes disinvite — someone to address their students. This year’s controversy centered around Dr. Ben Carson, whom the administrators of Johns Hopkins University had invited to address their students. As over one thousand Missouri students walked…..