The Dark Ages

As Europe tries to grapple with constant terror on its streets, no one has come up with any real solutions.
Western civil liberties will stop the rounding up of thousands of suspects as may be needed in this case.
The British authorities know the identities of the latest terrorists and knew about them before.
As they and others had not committed a crime before they were not arrested just watched from afar.
All people that have traveled to a terrorist haven in last few years should be arrested or placed under constant surveillance.
The next perpetrators will probably be known to British authorities they are potential suspects that may strike.
How do you address such threats within the confines of a liberal western country?
If there are a few more attacks then some kind of emergency measures may be taken that might allow the detainment of a some people that might strike.
Its a bit bizarre of the stories you hear that certain Israeli figures were worried about arrest over alleged war crimes.
These Israelis were mainly accused of fighting terrorist elements in the middle east.
The ideological cousins of the terrorists in London.
Many in England and across Europe are scared, very scared.
The very worst is yet to come.