It’s one question on a school exam, friend…
And at least the guy had the honesty to admit his irrationality when called on it. That, to me, reads more like coming to terms with his error in an edge case than it does a systematic campaign of maliciously frauding on the student
Nah. Admitting to murder doesn’t spare you from the deed. I would fire his ass.
Comparisons to murder seem to me to completely out of proportion to the issue. As faults of a teacher can go, this is pretty minor.