Good points made well. It's encouraging to hear that this individual disallows his personal politics or position of power to discourage or diminish genuine opportunity and consequences of disagreement. Unfortunately, tenure protects many in this position and too often the students have no genuine recourse.
Still, noting ...
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If exposure to an instructor for 16 weeks changes that value system - there wasn't much of a one in place.
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A nice thought that may reflect your circumstance. I suspect most profs would consider their efforts less than they'd hoped if they should fail to challenge and change opinions. That's what they're in business to do. And it's sorely naive to generalize your belief that somehow more than 3 or 4 Carnegie units are needed to move a mind.
More pragmatically, drop/add periods won't tolerate sampling much more than a couple of class periods.