Other than that, I cannot imagine internet voting ever being secure enough.

We have met the enemy, and he is us — Pogo

I think that State reprisals against voters for particular parties or candidates is not a particularly huge concern in the so-called developed world.  But there are still plenty of people within our "Western" societies who could face personal or professional repercussions if their political leanings were to be known, or who for a variety of reasons would rather not have their co-workers or family members know who they vote for, even within the confines of a particular political party.