Somewhere there is a money trail; there is simply no other way to explain why so many employers simultaneously jumped on board this bandwagon (despite the risk of lawsuits as people started dropping dead from the hot shots).
A. Impose harsh mandates on their employees, and face the prospect of massive lawsuits over civil rights violations and “vackseen” side effects.
B. Don’t impose the mandates, and face the prospect of massive lawsuits from employees who claim they contracted COVID from their coworkers.
Most employers probably just figured that B would cost a hell of a lot more than A.