God and there we go 'encroaching on civil liberties' you'll say suspects have human rights next and shouldn't be deported or indefinitely detained.
Are you being deliberately thick?
The encroaching on civil liberties was in relation to you and me (assuming you're not a terrorist), and her capacity to access all emails from the entire population.
Also, suspects, by definition are only suspects, not shown to be guilty. So, no they shouldn't be indefinitely detained or deported without a fair trial. With, you know, evidence.
Would you want to get a speed ticket without the police being able to produce evidence that you did deserve it?
What kind of society would the UK be if suspects were always treated as convicts?
And notice that the Terrorism Act already gives police the right to detain for longer, etc.
Seriously. Educate yourself, look at what has already been accomplished, already is in place and ask yourself what are the consequences of what you propose for your society.
Drunk people also kill when they drive. Perhaps the police should arrest every drunk suspect. And lock up for life anyone drink driving. Sounds reasonable?