You haven’t heard of busloads of “ignorami” have you? As an individually engendered misdeed the motive might be vanishingly small... but not when one has been set on some kind of jihad to “get back for racial inequality” or some such canard.
Well, I’ve known a lot of people who have committed a lot of offenses. I’ve never known anyone who told me that they went out of their way to illegally vote. And, that may explain why we don’t hear about many prosecutions. It’s just not a crime that makes a lot of sense for the perpetrator. And, maybe that’s why I have never known anyone who claims to know anyone who committed that offense.