I mean its a conservative one too - look at the moving goalposts to the right on Abortion, the right keeps demanding more and more stringent controls, gun rights too.
Even for religion. In one of the yeshivas in the upper west side of Manhattan, they painted longer sleeves on a photograph of the founding rabbi’s wife because it doesn’t comply with current modesty rules.
It's not the same problem, or any problem. The OP is a reactionary grasping at straws.
Anti racism activists want to end racism, not reduce it.
Anti abortion people want to end abortion, not reduce it.
It's different from March of Dimes people stuck looking for something new to do when no one has polio anymore.
The complaint that progressives move one to a new issue once they solve (or obsolete) one issue isn't some sort of weird disorder, it's reflecting the reality that one person can't solve every problem at the same time.
Also, "March of Dimes Syndrome" was invented by the Federalist, a zero credibility rag.