There is a large difference here:
* The GPL is pushing an agenda in their licence, and attempts to clearly state your legal obligations.
* Crockford, on the other hand, is trying to crack a joke in a legal document. As the author states, this is dangerous to people who don't understand the legal ramifications of using this. From what I can see, the author is venting their frustration that Crockford appears to be treating the whole affair like a big joke, and I can totally understand that.