Yes, indeed, they are free to quit their jobs — without having to give up on their house, country, and friends — if their assessment of the risk of coming to work is so drastically at odds with that of their employer.
Are you really so dense and solopsistic that you are incapable of understanding that for most people, this is no choice at all? For many Americans, yes, they will have to give up their house if they end up unemployed. Not to mention their health insurance - and I assume you aren't in favor of the government helping out with that either. You're pretending that personal autonomy isn't constrained by economic considerations, which is completely at odds with reality. You're also pretending that managers actually give a shit whether their employees are safe driving to work, when the history of industrial economies is full of evidence that they are often utterly careless without government intervention.
And if you don't like being told to move to Somalia, try getting some self-awareness and honesty, and admit that there are real tradeoffs to your utopian fantasies, with genuinely negative impacts on other people's lives. There are many persuasive and intellectually honest arguments for smaller government, but you're not making them.