Well, you can get water out of your tap, so there’s an easy alternative. Use a filter if your tap water is iffy.

In case you’re asking in good faith… The downside is that non-citizens voting is simply not a problem. The number of cases is extremely low, there’s nothing to “fix” here. The biggest impact of this policy would be that actual American citizens who do not have, or lost, or forgot to bring their proof of citizenship will not be able to vote. It will predominantly affect poor and marginal populations. People that don’t have a passport, don’t have easy access to their birth certificate, or aren’t aware of the new regulation. Fewer people voting is 100% the goal with this policy.

50% lethality in humans, not wildlife

There’s no simple answer to your question, just like there’s no quick solution to the problem of inequality. But one premise you’ve mentioned isn’t quite correct. The democratic party hasn’t really been “ruling” for most of that time. They’ve controlled the presidency, yes. But for all except 2 years, they haven’t controlled Congress (it’s been either divided or republican controlled), and they haven’t controlled the supreme court. That said, a lot of Democrats are still happy to push the status quo, and there’s plenty of warranted criticism to go around.