The question is whether it is harmful to free software to put unfunny non-jokes like this into licenses. The answer is "yes, it is."
Debian is not entitled to Douglas Crockford's work and therefore Crockford cannot harm Debian through incompatibility. Someone else can write a replacement JSON library; it's an intern-level project.
If you feel like you can call someone an "asshole" for writing "use this software for good not evil" in their license, then, and I mean this respectfully but directly, you need to unplug for awhile and interact with actual human beings in the world.
Similarly, if you can write a whole blog post calling Douglas Crockford "childish" and implying that he's not only a hypocrite but hypocritically evil for working at Paypal simply because of something he put in the license of a piece of software he gave away for free, you are a whackjob nutbag and nobody should listen to you.
Here is a clue before 8 different HN'ers explain to me how damaging idiosyncratic license clauses are and why that justified this nutball post: you can write a post about why people shouldn't use a specific free library without calling its author names.