What evidence or suspicion threshold are you suggesting for offing people? And what do you mean by camps? Who exactly are you suggesting putting in camps and for how long?
To be fair, even though I strongly disapprove of those kind of solutions: Offing suspects is exactly what the USA have been doing for quite some time now.
Ignoring the kidnapping, torture and imprisonemt of european citizens in europe and abroad without trial, the drone strikes executed by the US in Pakistan and other States which are not in a state of war is pretty close to "offing" suspects, especially when we look at the regular news of drone strikes hitting either civilians or cause massive colateral damage which include "military aged males" i.e. teenager 12 yrs old and up.
So . . you will imprison 'suspects', i.e. people who as far as you know haven't committed any crimes - forever.
I don't want to live in a world run by you, & if you ever try to impose your tyranny (for that is what you propose) on this country I will fight you in every way I can. You propose destroying civilisation in order to save it.
This is also my impression of Guantanamo Bay, isn't it for many of the prisoners?
We should not be so hipocritical and pretend to be shocked by the idea of implementing strategys at home we have seen abroad for quite some time now.
They are the community in which these threats live and work and play. They are in the best position to notice worrisome signs and behaviors. It's their civic duty to act responsibly to help prevent crimes. Assimilation is a 2-way street and any ethnic/religious group has to adapt to fit into it's adopted country. They are a big part of any solution. Inaction or apathy only contributes to the problem.
I do actually think that the community is cooperating already. The Goverments seem to have a fairly good idea of which moscs are the breeding ground of extremist circles and where an islamist scene is present. This is, given the size and numbers of the european muslim community, a pretty strong hint that the goverment is informed from within said community. It would be an extremly cost and time consuming effort to find those scenes if there were no cooperation. Besides that I don't see how the muslim community could present any further informations without "activly inflitrating" said circles and get in personal danger. Those terrorist operatives get some training and there will be a transfer of knowledge how to avoid detection and operate under the radar. I don't expect them to loan huge sums of money a week prior to the planed attact if you catch my drift, I guess they just keep on living their normal day to day routine till they act out their plans.
We should keep in mind that it is one of the goals of islamist terrorist to breed misstrust between the muslim and non muslim population to an extent where the hand of the goverment is forced to react in a way that strengthens the terrorists.
I.e. when we put pressure on the muslim community and show an attitude of misstrust "They sure knew" / "they wouldnt hesitate to report him if it was a non muslim", this will lead to a great part of the muslim population feeling insulted and rejected. From this position it is easy to see how an process of isolating oneself from the non muslim population can start and how maybe even unjust and extreme measures like torture or imprisonemt without supporting evidence of guilt may lead to a feeling of beeing forced into war with the "unbelievers".