Expecting police to prevent all crime is fantastical. Police generally serve to enable punishment, deterrence and incapacitation of criminals.

Furthermore, there is a distinction in motivation between propaganda and journalism, but the information itself is unaware of this. If a terrorist beheads someone, then sends a video of it to a journalist who publishes it, is the journalist simply reporting the news, or are they aiding terrorism? Certainly, the video may influence the audience, and cause fear, as the terrorist desires. How we can, or even whether we should solve issues like this is a polarising topic.