I'm just waiting for the day when someone (or a family member) sues a company or insurance agency for not allowing a person the means of defending themselves.
Concealed carry has been around a long time. With all the violence in the work place over the last 25 years or so I will hazard a guess that if a law suit could have been brought based on the grounds noted above that it would have been done by now.
IMO - the problem with suing in circumstances where one wasn't permitted to carry and thus died as a result due to violence in the workplace, or any other location for that matter, is proving that the deceased would still be alive if they had been permitted to carry.
Maybe some of our legal eagles could jump in and comment.