He has no intention of applying the knowledge he would have attained in the classes he cheated on.
Every student should be allowed to choose his own classes with as little requirements imposed by the school as possible.
That's not to say there couldn't be a list of recommendations preferably with an explanation why for students that have no idea what to take but forcing them is a bad idea.
Stop wasting students time with useless classes just so you can have a standard set of classes for each field.