People consume media that is constantly lying to them, they are surrounded by people being fed the same lies, creating a feedback loop that suppresses any opposition. It's even worse these days with social media and algorithms, they just constantly get fed the lies, the propaganda.
At least these people came around eventually. Lots of people dont think politics matters that much until it severely affects them. So its going to take that kick in the mouth, unfortunately. Even if they are still selfish in their change, at least it will help the masses.
Saying "I told you so" doesnt really help, people like this were truly misguided and deluded.
You dont have to flip to the other extreme. Nobody is saying to praise these people, just don't shun them. Perhaps they already voted out of spite, maybe they will again.
It's in our best interest to have them away from the fascist cesspool, even if I don't give much of a shit about them personally, for what they previously had a hand in.
Also, you dont know what people might see or read that changes their mind on something. Not sharing it at all is only negative. If someone who is deluded keeps seeing posts about it, maybe they will wonder why. Just scroll past it if it bothers you.