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Why is Debian the way it is?
(blog.liw.fi)
Debian is a free operating system (OS) for your computer. An operating system is the set of basic programs and utilities that make your computer run. Debian provides more than a pure OS: it comes with over 59000 packages, precompiled software bundled up in a nice format for easy installation on your machine.
Can someone explain this paragraph please?
The package pre and post scripts are run as root. These are the things that make sure users and groups exist and other such tweaks to the system. You are essentially trusting the packager doesn't put anything nasty in there.