First, the resources of libraries are limited, and opening to the outside world is equivalent to reducing the resources of college students. We can see the news that many college students get up early and queue up to sit in the library on the Internet. There are not many resources in universities that can be allocated to people in society. Moreover, people in society can't always sit in the library and study quietly. They have to work and answer the phone, and coming and going will also affect students' study at school.
Second, a large number of people in society enter the campus, which is easy to cause security risks. The quality of people in society is uneven, so it is difficult to guarantee that there will be no malicious people sneaking into schools in the name of learning; Like my school, there was an off-campus theft this year. The thief stole six dormitories. When he stole the sixth dormitory, he was found by people who came back from the dormitory and was caught. Once the university library is opened to the outside world, the floating population in the campus will be larger, the hidden dangers will increase, and the probability of danger will increase greatly.
Third, opening to the outside world will increase the management funds of the school. With the increase in the number of people in society, schools must increase the number of security personnel, and libraries must also increase the number of staff ..... These fees cannot be charged to off-campus personnel, so universities can only pay for themselves, because universities are not profitable places.
It is a good thing that people outside the university want to study, which shows that society is progressing, but university libraries are not suitable for opening. People outside the university can study at home or in a quiet cafe. If you want to borrow books, you can also go to the bookstore in the city to get a card, or read it online, which is very convenient and you don't have to go to the university library.
I hope my answer is helpful to you.