Why would any European go to Syria or Iraq? What kind of excitement can they get there? The problem is very simple, any eu passport holder who has gone to Syria / Iraq or the countries bordering them have to explain why they are going there when they return back. Isn't that simple. I get asked 100 questions and frequently I am checked for agricultural products when I come back from abroad.
A small country like Belgium, does not know who is coming into its country? They cannot figure out destitute refugees from wannabe /real criminals? They were just in lockdown mode a few months for what? When they can eaves tap on everyone's phone including mrs Merkel they cannot figure out the real criminal.