9/11 changed everything. If you insist on keeping a pr-9/11 mindset, may I suggest something from the 10th or 11th century.
(1) The position is slightly different in the UK from in the USA.
9/11 was on its own not as significant as in USA as other matters.
(2) Restrictions on Habeas Corpus had been imposed after WW2
in response to (Irish) IRA terrorism. They were not at all popular.
(3) However Islamic terrorism replaced IRA terrorism, and had two
particularly escalatatory characteristics (i) suicide bombing
and (ii) a willingness to use WMD (e.g. chemicals weapons).
(4) As a simplification; there are:
A) Timing related issues. How long before Crime Identification/Charge/Trial
B) Non Timing Related Issues
(5) For issues B,
not related to timing, the real drivers were two sets of legal decisions:
(i) UK appeal court judges started ruling that the UK could not according to european human rights laws deport foreign nationals strongly suspected (or even demonstrably proven) of terrorism back to their home countries where they could be expected to be unlawfully inprisoned, tortured, unlawfully tried and/or executed by state or by non state parties.
(ii) UK appeal court judges ruling illegal the indefinite detention (merely pending finding a country which would accept them and to which they agree to go to) of those falling in to 5 (i) above in e.g. Belsmarsh Detention Centre.
(6) The problem of what to do with (a) foreign nationals strongly suspected of terrorist intentions (but where there is not the proof beyond reasonable doubt necessary for a criminal conviction) and (b) and of foreign nationals released after serving prison sentences; all remaining at liberty in UK remains.
(7) Some of us here consider this legal position absurd.
For example suppose a notorious convicted Chinese/Iranian/Saudi US serial killer of children was to escape from death row; and hijack a plane to get to England. EU law would prohibit his return to China/Iran/Saudi/USA for execution. It is not even clear that we could inprison him for more than 28 days, and he would therefore be free to walk the streets of England.
In the absence of a legal remedy, we would no doubt have to rely on the person being found hung in his cell (cf UK British Harold Shipman and Fred West).
(8) For Issue A:
timing related issues the problem of establishing the evidence to identify the particular crime, charge and try second or third generation islamicists of British nationality (radicalised by the Iraq war) within a particular time period, which is primarily what the 7 day via 14 day via 28 day via 90 day arguments are primarily about.
(9) There are also separate legal issues about banning protest and deporting alleged fraudulent financiers to the USA under legislation introduced as anti-terrorism.
(10) I hope this helps explain the UK context.