The coercion's implicit.
Ever since these students were 9 years old, everyone around them including (and especially) those in public education have told them that they need to go to college and get a degree or they'd be destitute and living in a ghetto.
Then they get there and college is even more absurd than public school ever was. They sit in a giant lecture hall listening to these people who don't live in the real world with the rest of us talk about things that do not matter (how many credits were for something other than electives or your major when you went?), threatening to flunk them if they can't jump through pointless hoops.
So, they go back to the dorm after class, and do research the best way they know how, and they find relevant study materials. Did he catch them smuggling the answers into class on a phone, or written in microscopic print on the inside of the rims of their glasses? Were they copying someone else's tests? Did they pay a lookalike ringer to sit in on the exam for them?
Hell no. They did what they were supposed to do. They found what they thought were the correct answers, and went over them enough that they could remember them during the test.
Why would anyone bother to go to this trouble? Because they were coerced. They've been coerced since they were children. He doesn't get a free pass because someone else volunteered to do the coercion for him.
I might be a little more forgiving if they were philosophy majors. If that were the case, then presumably they chose this field of study, and the class itself is relevant to that such that they should be putting in more effort... but even in that case, it is sufficient to fail them, because the low scores are their only real failing. Even then they haven't cheated.