For the same reason this happened exactly this easy in the past! This was nothing new! Conspiracy theorists just didn't have the nuance to know about it in the past.

Making a cheap good for many people opens companies up to risk. Even frivolous lawsuits are expensive and if they are getting pennies per customer even a frivolous lawsuit can destroy the profits of millions of successes deployments. Vaccines like the last round had serious issues on the order of 1 in a million cases. Even that low rate is enough to crush profits with medical costs the way they are.

I'm not familiar with a time in US history where all govt contractors, the majority of employees, and the recommendation to companies and that they complied with requiring employees get a relatively new, not completely approved vaccine to keep their jobs. Could you please cite some references to this kind of thing in the US?