It’s one thing to say someone is acting unprofessionally. It’s another thing altogether to accuse them of being on a path to genocide. If I did that to someone when it was so clearly uncalled for, I would be an asshole and my relationship with that person would be strained from that point forward.
If you don’t like that strain in your workplace, you try to draw a line on speech. It’s not something I’d want from the government, but it seems appropriate for a workplace.