You're right Republican voter fraud is statistically zero. So is Democratic voter fraud, they are both statistically zero.
Unfortunately Voter suppression is real. Examples of it are when States purge thousands of names from voter lists, or reduce polling places in districts that are Democratic, or have a lot of minorities, limit early voting, send "ballot security" people to polls to challenge peoples credentials so that it slows down the works and people in the long lines give up and go home. There is a whole arsenal of voter suppression techniques, and that is a form of cheating that is real.
Americans have the right to vote, and making it difficult for them to do so is what I find morally repugnant.