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I can sympathise. It happened to my family a few years ago, and I blame it on the Fox News channel they had unaccountaly started leaving running in the family room.
That said, perhaps there is hope. They went through passions and enthusiasms for the various hateful talking-head talking points, but it was surprisingly "non-stick." They've become more moderate again, despite the occasional flare up.
The lesson I guess is that we shouldn't dismiss others as lost causes to the Republican Pod People. Avoid politics until they can calm down enough to talk respectfully.