The left ran out of even relatively sane groups to try to use as "oppressed victims" to promote their righteousness. YOu'll note that things really went out of control after gay marriage went through in the US. Suddenly it was all trans, fats, and pedos.  The leftist "progressive" bullshit doesn't work without the "moral high ground" from "being on the right side of history" by advocating for some new downtrodden group.