Because the internet (specifically Twitter) flipped the fuck out when it was announced that a juror on the Zimmerman trial was going to write a book about the experience, the juror's literary agent pulled out of the deal:

And then the juror released a statement:

I realize it was necessary for our jury to be sequestered in order to protest our verdict from unfair outside influence, but that isolation shielded me from the depth of pain that exists among the general public over every aspect of this case. The potential book was always intended to be a respectful observation of the trial from my and my husband’s perspectives solely and it was to be an observation that our ‘system’ of justice can get so complicated that it creates a conflict with our ‘spirit’ of justice.

Now that I am returned to my family and to society in general, I have realized that the best direction for me to go is away from writing any sort of book and return instead to my life as it was before I was called to sit on this jury.

Yes. The poor dear didn't understand the depth of the public's pain. I'm sure the agent backing out of the deal had nothing to do with this decision.