The depravity of college students is often a matter of mentality. In primary and secondary schools, what we do is bound by parents and teachers. When we get to college, our "animal nature" will break out and no one will take care of it. So we waste our time to the fullest, become degenerate, have no goal in life, and only have the idea of eating, drinking and having fun every day.
Universities pay attention to self-study. Whether you want to learn or not is your own business. A good teacher can urge you at most, and it doesn't matter much. No one will force you to learn, so many lazy people relax and learn nothing. Many people lack their own thinking, and they don't want to be decadent or confused. It is absolutely beneficial for people to set a goal for themselves and an achievable goal, so that they have the motivation to look forward to it, and take time to read more books, preferably every day.
Universities are relatively free in all aspects and have plenty of time, which will breed many ideas that they didn't have time to do before and have no chance to do, and gradually degenerate. At present, the management of students in universities is completely free-range, and life is kept in captivity, so it may have caused widespread confusion among college students.
There may be more than one reason for college students to fall, but I think only people with faith will avoid falling.