Every person has a right to privacy, and a duty to respect the rights of others.
Although the default file permissions of UNIX make everything publicly readable, this does not imply that you are welcome to examine anything that the operating system will allow you to. It often happens that new users are not aware of security considerations or how the file protection commands work. Even experienced users may forget to protect their sensitive files from reading. Do not examine the contents in any way, even if the permissions are set so that you could. Don't even list the directory.