To give some context, Counter Terrorism Policing creates a range of guidance documents for use across the whole of policing, not just by counter-terrorism officers or Prevent practitioners. It produces these documents to help frontline officers and other colleagues make informed decisions, including about protecting crowded places at times of protest—something that Figen Murray has done amazing work on.
The signs and symbols document that became the subject of the Guardian article was produced to help the police and close partners identify and understand signs and symbols that they may come across in their day-to-day working lives, so that they know the difference between the symbols for the many groups they may come across. But these things have to be done correctly and in the right context. The police themselves have recognised that this was an error of judgment, and they have withdrawn the document and are reviewing it.