They should have better boarder control, background check on people before letting them in, communication with other countries, and better integration. Also perhaps programs for more tolerant people, and ease/integrate immigrants in instead of more religious and toward the extreme end of the spectrum.
There are many other solutions without sacrificing freedom and privacy.
Rather than investing in these suburbs and getting human eyes and ears on the ground. We spend many millions more on bombs and anti terror units.
Encryption is an easy scapegoat and convenient for power grabs. Saying 'we mismanaged these suburbs' takes political courage.
Can you explain that a bit? There is not enough political will to impose order there or something else?
In the case of Belgium, one of the problems is that there was never a push towards integrating North-Africans. Traditionally, the left has been in favor of 'multi-culti' -- you basically allow minorities to form their own community without much outside interference. As far as I understand, this has been strengthened in Belgium by the socialist party, which pretty much maintained this non-interference policy for votes. This leads to problems, because in other cities/countries family and friends would signal radicalisation to the authorities. Here, many people do not even speak Dutch or French and mistrust authority.
Integration of the Muslim community at large in Western Europe is for reasonably large numbers of people a failure. Of course there are also plenty of people that did integrate and that will stand up to defend the values of the countries that they have adopted. But not at the level that Canada has managed to achieve.