Question about protection, security, and ethic in OS:

Take for example the Windows 10 Operating System which proposed (and used) forced updates.What are the reasons for a user to not want forced updates? What are the ethical implications of the shared update structure of Windows 10 (users download small pieces of updates from any other Windows 10 user, similar to torrent and le sharing software)? Who is liable in the event of a security breach? What are the reasons updates are necessary for user?