You don't get the joke? Ok. The poem by Martin Niemoller is often used by far-right apologists to draw a false equivalence between themselves and their opponents, implying that anyone who would fight right-wing extremism is just as much of an evil as the Nazis, doing so under false pretenses, and will simply by virtue of their opposition act as the Nazis themselves did.

And yet, in reality, the people who want to "come after" Jews, gays, gypsies, etc are those extremists, not the people opposing them. The slope is in reality only slippery in one direction.