This is an unfair take. Whatever you think of Meta as a corporation or Zuckerberg as a person, neither caused the Rohingya crisis, much less the conflict; and while it's fair to argue that FB/Meta could have done more to stem hate speech on the platform, your phrasing intentionally villainizes a single individual for an entire ongoing, complex sociopolitical situation.
I have intimate knowledge of FB during that period. Any voice of concern about abuses of the service were repressed as a "we'll deal with that when it's a problem."
Concerns about lack of global moderation and enforcement were well known before the massacre. Mark and leadership made a choice akin to what the major oil producers did regarding global warming: kick the can until it's a problem.