Exactly how was that poster MEANT to be interpreted?
Like many sayings, they leave off some of the sentence that is assumed to be understood by those in the know. So if you’re a Muslim you know it means:
“Build a wall of resistance against Muslim extremism.”
“Don’t talk to the F.B.I. unless you have helpful information; otherwise, you are wasting their valuable time.”
See, it was all just a misunderstanding due to our own ignorance. They’re really trying to help us.