The "investors" suing are just working with/for attorneys that extort massive legal fees and damages from public companies for a living. This case has nothing to do with the underlying conduct, which was merely a clerical error. These attorneys are one of the big reasons that unicorns are staying private. The most famous of these bottom-feeding attorneys, Bill Lerach, built an estimated net worth of $700 million [1]…
It was likely a clerical error, in this instance. But that was only after discovered after the law suit. Should we give these corporate boards the benefit of the doubt? That's funny.
>by creating exactly these kinds of nonsensical shareholder lawsuits against public companies
It isn't "non-sensical".
There are rules and laws that govern public companies, and public companies are obligated to follow them. Someone has to keep people honest, and in the US that's often done through the courts.
I'm sure Facebook and Mr. Zuckerberg will learn a lesson to be more diligent in such matters. That's the point.