Once again, it is no one's position that there is no voter fraud. The argument is whether there is enough to justify throwing out the baby with the bath water, i.e. making it too difficult for the poor and marginalized to vote in order to catch a low incidence of fraud. Complicating the argument is the fact that the poor tend to vote democrat, so there is a higher ROI for reps on chasing fraud, but that is a separate issue.
If we don't like the social, economic, and political ramifications of having a two-tier society where the poor outnumber the rich 99 to 1, don't have a two-tier society where the poor outnumber the rich 99 to 1. (Note, ratio not to be taken literally, but to make a point.)