Not to downplay how frustrating that must be, seriously, I live in a regressive area as well. It genuinely sucks.

What i find works moderately well is to describe programs in ways that benefit those people directly. Meet them where they are willing to be; selfish.

Don't mention the other people, focus on how it could help them and their family and friends.

If you can’t fix selfish, which in this economy you probably can’t, fix framing. Make it all about how much they win from social programs that “they pay for and don't get any of”. Thats getting easier to do with healthcare and UBI, as things get worse and the top few benefit, and they apply to everyone. Don't mention that it helps other people at all. Thats’s a negative to them, just tell them how much less they will be paying, how much their family will benefit with that extra money.