Regarding the United States at least, there are topics that we, as a country, have decided are not up for debate in the workplace. That's a feature not a bug; we've had enough decades of, for example, observation of how covert and overt racism harms people it is directed against that we've made it the sort of thing that companies can be directly liable for if they allow it in their space.

There's a hundred years of history explaining why the balance point between freedom of speech and freedom from fear has been calibrated thusly.