You're incredibly naive if you think this kind of stuff doesn't happen all the time since 9/11. I personally know several people with similar stories in the US.
You know several people whose employers sent someone to their house with FBI agents to harass them about their religious beliefs?? And none of them sued?
I’m not surprised at all that the FBI is harassing people, I find it incredibly hard to believe a private business would touch the situation with a 4,000 foot pole. They have absolutely nothing to gain and massive liability.