The problem is, if the government did mandate it, the employers would probably be shielded from liability. Since the government has not mandated it, then the employers bear full legal liability for their inserting themselves into employee healthcare decisions. Side effect from the vaccine? Sue your employer. Get sick from COVID anyway despite the vaccine? Sue your employer. Heck, someone at work sneezes on you, sue em!
What if your employer mandates that you get vaxxed, then you comply and subsequently die from complications resulting from the vax?.........................