On a related note, I believe (based on no evidence) that Zuckerberg knows of a lot more nasty dealings and wants to crucify Wynn-Williams to scare off any potential whistleblowers.
If you have no evidence, then why do you believe it?
And she left long time ago. It is even more unlikely that the company magically became clean after her leaving.
A company and founder with such an extensive list of publicly known misdeeds (starting with Facesmash), chances are that there are many skeletons left to uncover. Setting a precedent is no unknown course of action.
It's not much to go by, but I am a commenter on HN, not a lawyer and Occam's razor doesn't disagree either.