Let me use another scenario. 1969, Brazil. Members of a revolutionary group kidnapped the US Ambassador. After that, and a few other incidents, the government used the same argument you presented to review and approve contents of newspapers, magazines, radio shows, movies and correspondence.
Do you believe it is OK to do this, in order to disrupt their planning? Do you believe it becomes not-OK if the target of domestic terror is a tyrannical government?
[1]: https://www.insidehook.com/article/history/kidnapped-why-an-...