The right wing is using propaganda tactics that are known to brainwash and dupe many people, and you're not going to treat those who got brainwashed and duped like victims too? Yes, they're adults, and that means that they have to take responsibility for their vote. Once they do, admit they were conned, and express willingness to join the fight, it's important we accept them with open arms so they know our side is better than the other side.
As long as they're doubling down on fascism? Hard agree, they can kick rocks. Once they see what's really going on and are willing to fight it? Welcome to the team, sorry about what happened to your dad, let's see if we can get him back.
Every person like this is an opportunity to gain an ally. It's an opportunity to find out if this person was conned or is selfish. We lose that opportunity if we mock them instead of offering a hand in solidarity.