Do you have a specific question? It’s tragic obviously and impacted many of us.
Of the handful of people I know who work at FB, all of them are super smart and motivated. Half of them have expressed a lot of anxiety, stress, and imposter syndrome to me over their reviews. I’ve seen this at other companies when a project is failing but I hear about it at FB from A players who are working on successful projects. It gives me the impression the managers must be brutal - like they just push harder than other companies and make people feel they aren’t good enough to get more output. These are my impressions as an outsider. Does it seem fair to you?
Leadership sets the tone and culture so it's always leadership's fault if culture is toxic.