Grief is hard and what's happening in Gaza is tragic, but this is not what the workplace is for. Why is it Microsoft's job to provide the described space?
Maybe this is less of a thing on the coasts, but where I live people have families, friends, churches, bars, clubs, and many other outlets that are designed for this kind of personal reflection and mourning. We don't expect our workplace to provide it for us because we don't live at work. We go into work to earn money to provide means for us to live our lives outside of work. To the extent that we want our coworkers to be involved in those spaces, we invite them to be.
More than anything else what I'm getting from this is that the death of the third space on the West Coast must be well and truly complete, if this kind of line sounds reasonable there.