There is absolutely no purpose to these purges, except to stop legitimate voters. Considering these are people who did not vote in some prior elections, it seems unlikely that they would now suddenly start voting multiple times. Plus, of course, in-person voter fraud is basically non-existent: there is about one case for every ten million votes, and almost all of them are due to negligence.

"It's the law" is also a strange argument when it's the law that's being criticised.