No, this is a bug or design flaw. When you create an unprivileged user,
that user does not have access to ifdown by default. Of course not! Then
why should the user have access to shutdown a network interface using a
GUI tool? It makes no sense. However, this bug has nothing to do with
network-manager. nm-applet _should_ be able to deactivate network.
However, an unprivileged user should not have access to run it. What
surprises me here, is that nm-applet doesn't use ifdown for that task. I
have discovered other privilege-related issues and will file a separate
bug on that.

-- 
network-manager allows an unprivileged user to disconnect the network from 
xdmcp login
https://bugs.launchpad.net/bugs/104173
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