These guys and gals in college are still pups with mature levels of wisdom and discernment still yet to be fully developed.  So many fall prey to the vultures out there or even to their own sense of self-hype with social media.  

That said, I agree with the hope that players can reach out and honestly provide feedback as to why they left.  Did they complete their degrees and are uninterested in pursuing any more education?  Did they hate school and were ready to go regardless of degree progress?  Who told them they were a "lock" to be drafted and how much did that advice cost?