There's a massive gap between the disenfranchisement happening in the South and other parts of the country, and people who without incredible effort can vote, but don't.
You're talking about "a lot of cases", sure, whatever, I'm talking about "the rest of the cases". Which is a lot, maybe even a majority, of the massive numbers of environmentalists who don't vote.
It's not that they can't, it's not that they're suppressed, these people just DON'T.