Think of it this way. Back in the Bill Clinton era, there were always stories of the “trail of bodies.” If you gave any credence to them at all, you were a nut, a conspiracy theorist, a true head case. One of the ways I knew that Hillary Clinton was finished is that the “trail of bodies” meme went from a strident outside case against them to a cynical inside joke. It no longer had to be believed — it just had to be believable.
What this does is tell you how much “juice” there is in a movement. When everybody gets the joke, you are in trouble.
We are in a similar place when it comes to radical Islam.