Your statement of the employers concern is obvious. My question regarding the bill of rights is, so far, unaddressed by your response. Freedom isn't comfortable. If one has the freedom to keep a bible locked in the car under the guaranees of the first amendment, how does one lose ones rights under the second.
Because there is a line drawn around every amendment--the clear and present danger line, you can call it. It's why you can't shout fire in a crowded theater. Where that line is drawn for each right depends on the circumstances of the right involved, and that's the point of my comparison.