Label? Context? These are not Unix concepts.
They are now. It's true that they weren't present in V7 Unix. But then again, neither were many of the other concepts we find in a modern day Unix. That's the nature of progress. Things change. It took me a long time before I was sold on SELinux, and my gut instinct was to turn it off, and run my machine with traditional Unix permissions. But just as I wouldn't dream of running a machine without a firewall in 2008, I now wouldn't dream of running one without SELinux. The landscape has changed, and Linux (and indeed, OSes in general) need to adapt. The benefits of running SELinux outweigh the initial pain it caused, and I believe Red Hat are 100% correct to have it turned on by default.
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