There is by now a well-honoured pattern observable in the aftermath of a terrorist act. First, there is the (very) public and politicised discussions on whether the relevant authorities had the necessary means and measures to pre-empt the attack. Then, almost inevitably, in order to be seen to respond effectively to the attack as well as be able to prevent further attacks, governments usually seek to expand their counter-terrorism and security toolkits with more far-reaching and, at times, controversial powers...