If something happening in society or your personal life is preventing you from doing your job, you don't have to explain it in the company wide channel. In fact, doing so probably won't help you or the company much. Most companies offer sick days and mental health days, for which you don't need to provide any explanation whatsoever. Many companies also pay for confidential mental health services. If your problem can't be solved with those benefits, disability insurance is also commonplace at companies and typically covers mental illness that would prevent you from doing your work. Companies should offer all of those things if they don't. I would go so far as to say that companies should be legally required to offer all of those things if they don't. But I don't think talking about personal or societal dumpster fires in the company chat will do anything to help the person affected, and will likely cause one person or group's problems to affect the work of the rest of the company without leading to any kind of resolution for anyone.