That is (was? not sure what the systemd and gnome people have decided
for us) the intended behaviour. The network setup is part of the system
configuration, not owned by a normal user.
Of course the problem you describe is real, and the solution is full
disk encryption (FDE). It's offered by some disks (pro: hardware, easy
to use, everything encrypted, even /boot. con: manufacturer backdoored),
or software solutions like cryptsetup/dm-crypt.
FWIW, there is potentially a lot more information in /etc, /tmp,
/var/tmp, etc. which you wouldn't want an attacker to get access to, so
FDE is pretty much a must if you care about such things.
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