A government has a duty to safeguard its citizens and also to prevent evildoers from spreading their message and actions beyond its shores.
Human rights must be protected effectively, but also without restricting the rightful freedom of innocents.
Everyone living in or visiting the UK should have the right to a fair trial and normal rights of free speech (including the right to criticise: government policy, government agencies and the police, and their actions; a reasonable right to fairly criticise individuals; and a right to demonstrate).
No-one living in or visiting the UK should be permitted to carry out or incite acts of violence, make threats of harm, harass, stalk, or damage property*
(*unless in exceptional circumstances for altruistic reasons: to prevent a crime, e.g. to disarm or overcome a dangerous assailant; or to prevent harm - e.g. in the event of suspected accident or fire or on hearing sounds of distress, breaking a door or window to gain access and effect rescue).
In the case of criminals, and those promoting terrorism by others, fair trial still applies, but it is appropriate to allow surveillance, arrest, and imprisonment, to prevent crimes or escape, during due investigation.
Guilty UK nationals judged to require imprisonment should of course be imprisoned in the UK.
Lesser crimes (fraud etc) may suit extradition/deportation.
More serious crimes (assaults and terrorist offences) may justify deportation, but it may be safer long-term in UK interests to imprison such offenders in the UK, whatever their origin, so that their location is now known and to avoid possibility of further offences if deported (including overseas planning of future attacks, perhaps by others, using information they have acquired here).
Useful intelligence may also be gathered from prisoners by holding them here: insights into both the psychology of such offenders (so as to counter indoctrination of those held, and of others in wider society), and into their operations: their contacts, methods, intend
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