Surely a distribution provides some level of trust, but even Debian may not provide all the necessary packages. For example, recently just to compile some stuff I had to download random packages (and trust that they are OK) from at least 3 different servers. Plus using a distribution offers no defense against bugs in applications that connects to network that can be exploited. And a bug in a browser allows to take the whole desktop.
> Yes, Amazon Kindle, Skype and other proprietary apps (if they appear for tablet linux) cannot be trusted and may not be avoidable for most users. And they can read all your files. But they can already do that on desktop linux.
Barring bugs on Android Skype cannot read passwords and other private data for other applications.
> The X server can allow display from all local users (applications), and each application can run in its own UID.
From http://lwn.net/Articles/517375/ - X11 provides isolation only between users, not between applications run by the same user.
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