It's good to be against voter suppression because voter suppression is bad, even if in theory it doesn't help "your side". One would hope that doing that work would convince some people you're on "their side", but it's quite nebulous.
Because the GOP isn't a monolith. Lots of them are still operating under a playbook 2024 proved obsolete. Race is no longer an almost-perfect proxy for partisan affiliation [1].
[1] https://www.npr.org/2024/11/22/nx-s1-5199119/2024-election-e...
How does one actually convince someone of the “rightness” of their side? It somehow starts with love your enemies, though if I say that to my more right wing friends it means capitulate to whatever the progressives want. All I know is the spirit of the age is evil.
Passing laws to make it harder to vote, and easier to challenge a persons voter registration and ballot, and then running an operative campaign to specifically target voters on the other side of the political spectrum is a bit different than "just politics". Legal, sure. Ethical, moral, fair, absolutely not.