Amazing-- a class of (apparently) 30 students mysteriously synchronized on three answers to a wide open question. And alarm bells didn't go off in the professor's head that maybe there's some confirmation bias going on in this non-scientific survey.
Also amazing-- once the professor figured out that his students didn't have the prerequisites to understand the material, his next question was not how much debt the students had taken on in order to pay for this and presumably other classes they have no chance of understanding. This is especially irresponsible given that a) if they can't read on a third grade level it is certain they can't calculate compound interest and b) freshmen were enrolled who the professor could have at least convinced to drop out before accumulating so much debt they'd never be able to pay it back.
But instead of a courageous act of dissuading them from continuing down what is clearly the wrong patch-- an act which no doubt would have brought the dean's wrath-- he shames them for not having had a quality education-- something that is safe to belly-ache about to colleagues. And he left teaching anyway!
Question: did he give the money back to those students who had no chance of learning anything from the class he was paid to teach?