It's not enough to accept any government's explanations for censorship or unlawful detention. We have to consider what compels government to do what it does, in general. That is, the pursuit of power.
The promise to "fight terrorism" may provide a fig leaf, but barely that. "Terrorism" is whatever a government chooses it to be, and this definition will be used by those in power to pursue more power.
my view will be informed by these points:
1. Governments lie about the scope of their surveillance measures against us.
2. Governments say that what they are doing in the war on terrorism needs to be secret, but governments have an established record of lying about their need for secrecy.
3. When governments say that they are using their powers to fight terrorists, government are lying. Government actually use their expanded powers to pursue whatever they want, including copyright infringement and the War of Drugs. Therefore it would not surprise me in the least if a nominally anti-terrorist measure were stretched here to accommodate a leak investigation.
4. Governments say that they are using their power to fight terrorists, as if the identity of "terrorists" is a static and principled matter. In fact, who is or isn't a terrorist is a political question resolved in the discretion of the government based on the balance of power at any given time, as I learned to my regret.
If a government knows it will draw attention by detaining a somewhat high-profile individual, what prevents that detention or harassment of you or me?