state audits and data compiled by groups across the political spectrum have found no indication that noncitizens are voting in large numbers.
Basically, rules imposing additional requirements on voter registration prevent vastly more citizens from voting than noncitizens, since the latter aren’t trying to vote.
The point is to make it harder for “those people” to vote and participate in society. If you came up with a magical, iron-clad, mechanism for everyone to have ID, the conservatives wouldn’t support it because that’s not what they want. They want minorities to suffer.