I still flame twitter now and again. I can't help myself.
Start making them watch documentaries about the subject. My now deceased old lady was in a similar place. I would tell her all the things that are behind the curtain. She would take it in but it wouldn't stick. One night I was watching something about our currency and corruption, shit I'd been telling her for years, as soon as she heard the same words I'd been saying through the TV, all of a sudden it was real.
Give it a try, couldn't hurt.
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