I understand that this can be disabled.

Do you think a *default setting* that allows this is sensible?

If this was applied to other functions ( cups is the example I gave), it
would be equally easy for the admin to disable the default if desired
and allow more users to access that configuration - but Ubuntu doesn't
do that for cups, yet it takes the opposite view for nm-applet /network-
manager?

Why is this not restricted by default, and set to allow the admin to
loosen the permissions as appropriate?

Simple example:  home user with kids sets up xdmcp on local network
because it's an obvious and easy way to save money on hardware and take
advantage of the network transparency of X. Kids discover that they can
disconnect parents by clicking on the applet. Parents have no unix
training and are apoplectic that this is possible...

Think outside the sysadmin mindset for a moment and you will see my
point.

Most people will run screaming from commands like chmod , and I stick to
my view that the groups and permissions for this should be restricted by
default. There could be a popup dialogue that informed users that their
admin needs to loosen the restrictions as required.

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