Nothing happened to them it is just a manifestation of their inner being. They are losing all relevance and are trying to hold on any way they can.
I have a dear friend who was kind of a mainstream Democrat, up until about a year ago.
But since then, she's gotten progressively (no pun intended) nuttier and nuttier, to the point now where she puts up five to seven posts a day on Facebook with online signature initiatives, all kinds of "articles" from every progressive group on the planet, on and on.
A few months ago I offered up a little resistance to one of them and she went crazy. Since then I just leave her be.
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