1. It is forbidden to destroy a path that the public has been using with permission.
2. Torah scholars retained an aspect of Divine inspiration even after the Beis ha'Mikdash was destroyed.
3. Since the Beis ha'Mikdash was destroyed, prophecy was taken away from the prophets.
4. A person who often drinks wine will become smarter.
5. We force people not to act in the manner of the people of Sedom.
A BIT MORE
1. This is even if the owner now wants to use it for something else. Of course, a person may protest if the public starts using his path without permission.
2. According to some, they are considered to have greater wisdom than prophets. The verse states, "And a prophet has a wise heart" -- since a prophet is praised by saying that he is like a scholar who is wise, this implies that the scholar is greater than the prophet.
3. Prophecy was given to children and to mentally incompetent people.
4. The Gemara derives from the verse, "Wine opens up Besulos," that wine opens a person's heart and makes him smarter.
5. When one person does not want to benefit another person even though the benefactor will lose nothing as a result, Beis Din forces him to benefit the other.