i never said UAC was bad, or unnecessary, but MS's implementation of it was overbearing, resulting in most people disabling it. as for linux authorization, it's a whole different world. if you're installing anything in your home directory you rarely need any extra privilege. root is only required if you're going where most users don't need to tread. and /usr/local was created years ago to keep people out of system areas.
if you know unix programming you'll know that invading another application's memory space is very difficult to do, the kernel is pretty good at enforcing that.
"operator errors" will always be the weakest point.
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