That's not the issue. If you don't want to abide by my rules on my property and you are concerned about your safety, then go get a job someplace else. Where do you get off with this sense of entitlement?
BTW, as much as I have the right to prohibit my employees from possessing a firearm on my property, I also have an equal right to require them to possess a firearm on my property as a condition of employment and again, if they don't like my rules, then they can earn their paycheck someplace else.