First I want to say voter ID laws are in practice intended to disenfranchise voters. Which makes them unethical. I have also never seen any evidence that it's

First I want to say voter ID laws are in practice intended to disenfranchise voters. Which makes them unethical. I have also never seen any evidence that it's an actual problem on any significant scale. But, in theory, I think the threat model is there. Here in Texas, you can get a list of everyone who is registered to vote. Most states make these lists available; in Texas, it's available to anyone. So that takes care of one of the steps of identity theft, which this is a form of. In my county, we also allow people to vote at any polling place (so you can vote on your lunch hour, etc.), so you wouldn't need to drive to anyone's precinct. You could just visit which ever polling place(s) are convenient. I agree it won't work if the person has already voted. But you're in a race with the voter, and you've got a 50% shot at winning that race. And voter turnout isn't 100%; it's more like 50-60%. If that voter is one of the 40% who don't vote, then you win that race by default. If they're one of the 60% who does, then you've got a 50/50 shot. That adds up to 70% odds of success at stealing their vote. You can even optimize that further by looking at demographic data about voter turnout. Young people, for example, have low turnout and old people have high turnout, and the voter rolls include date of birth.