But then you have the issue of voter retaliation and discrimination. That already happens in certain places in this country if someone even thinks you vote a certain way. If there was a reliable way to find out who someone else voted for in the most recent election, there would be huge social implications.

What if you lose a job because of the way you voted? An employer would not have to disclose that as the reason or any reason at all. Most states are employ at will states where you can be hired or fired for any reason at all with a handful of exceptions. And even with those exceptions, it is very very difficult to prove if those exceptions have been broken.