I'm not sure what you're getting at. It's only the subject line the parent is referring to. There are practically infinite possible choices for a relevant subject line on any topic, with varying degrees of specificity and tone. Zuckerberg chose super-low-specificity, super-high-negativity. It reads to varying degrees as impetuous, petty, vindictive, ominous, drunk on power, and emotionally retarded (in my personal opinion). It's also unfortunately not terribly surprising/rare in situations like these.
Even something as crap as "to the leaker: please resign" would be infinitely better. At least that won't give the entire recipient list a heart attack.