No foundation to stand on, so to shall they fall in due time.
That they will fall is inevitable. So what? The Nazis fell "in due time".
We are witnessing in real time the top floor of the Holocaust Museum - where all of the obvious propaganda is on display. As visitors tour they proceed downward. Each floor is worse. One leaves the museum "in due time" also, but not before traveling through the bottom floor. There, if one is old (and tall) enough, the atrocities that were committed may be seen by viewing over the walls.
The point is to stop the progression at the top floor.