It would definitely make me question how much I cared about the sign, and ask myself difficult questions about why the FBI were getting involved. I’d probably even engage a lawyer. But it’s not clear to me I’d take it down if — after all of this — I’d decided keeping it up was the right choice?

That might cause me to ask questions like how I felt about the message on the sign. If it was, say, my support for a political candidate I’d be calling the ACLU and local media. If, as in the case of Twitter, it was something untrue about the upcoming election left by someone at a party who I’d already had to ask to behave better, I would probably regret only that I hadn’t asked them to take their sign and leave earlier.