Aaah, the magic of sudo...

@carinswm: Its not just installers that can't mess with system files in Linux, viruses, little children, accidental keystrokes, hackers, spammers and etc... In linux - if you ain't got the sudo code - you ain't got acces to me system files... Your files fine, but the system files or someone else's files higher in the permission heirachy - no sudo code, no can do.

Its a nice system when you use it every day though, and since you haven't got to worry about viruses being able to do anything, you don't have to spend any resources on an antivirus etc...