I'm 100% okay with Clemson University not firing professors for their comments on Charlie Kirk, provided that they are 100% consistent on their hard free-speech stance.
If I were running a business right now, my policy would be that my employees would have to put "Opinions are my own" on their real name social media accounts and I would let them say whatever they want. I don't think harmful opinions from employees alone has ever hurt businesses in the long run.