It appears the main effect of Motor Voter registration is to register more people who don't care enough to make even the minor effort needed to vote.

This makes sense. If a person is not motivated to take the simple steps needed to register as a voter on their own, they are far less likely to vote, even when our state makes that so easy with mail-in ballots. In states that still require voters to go to the polls, these folks would be even less likely to make the effort to vote.

When Republicans who want to require voter ID to avoid potential voting fraud are accused of suppressing minority voters, I don't believe it. Registering and voting requires only a minor effort, but  if a person doesn't care enough to do the first, they probably aren't going to care enough to do the second. The arguments for why anyone can't do these simple things are just silly, and according to some blacks, racist.

https://www.youtube.com/watch?v=rrBxZGWCdgs
https://www.youtube.com/watch?v=d1h3UJxOBBI