In line 31, the connector “Hence” introduces a logical conclusion.
The sentence “Michael Hayden asked to send an e-mail to all staff” (R. 10 and 11) can be correctly paraphrased in the following terms: Michael Hayden enquired all his employees if he could send an electronic message.
The idea expressed in “Counter-terrorism (…) is pre-emptive” (R.31) can be also found in the following proverb: It is better to prevent than to cure.
GCHQ experts decided to stop producing academic papers about code-breaking techniques only in the two last decades of the last century.
The author defends the idea that the fight against organized and sexual crimes has diverted invaluable but scarce resources from what should be America’s secret services’ main goal: the combat against terrorism.