I'm not going to bother engaging with you from the perspective of morality and ethics, since it seems unlikely that would resonate with you. Instead, I will point out how wrong you are purely from a financial lens.
The goal of a CEO of any company is to generate long term shareholder value - eg. to make the company more valuable than they found it. Mark Zuckerberg has been the only CEO that Facebook has ever known, and obviously he has created a lot of shareholder value during his tenure. On the other hand, Facebook has also lost about half of its value in the last year or so. A dropping valuation is typically a lagging indicator of a major strategic blunder or disruption. The market is essentially saying that he has done a rather poor job for the past 2-3 years and the outlook of investors is diminished accordingly.
And yes, hiring a ton of people and then having to lay them off in a short time frame is a huge part of this. In a tech company, profits today are the result of long term execution of strategies and represent a return on capital investment. A designer or engineer hired today is not going to deliver much that will create revenue or profit this year. There is an old axiom in tech companies - if you want a little profit today, hire a sales exec. If you want a lot of profit in three years, hire an engineer.
Bulking up your technology team only to have to skinny it down later is a massive strategic and employee distraction and is absolutely a sign of mismanagement.