Ultimately, freedom and democracy are stronger than fear and tyranny.
Europe has a long and tragic history of mostly domestic terrorism.
If you combat an international phenomenon, it is indispensable to share information internationally.
In the fight against terrorism, national agencies keep full control over their police forces, security and intelligence agencies and judicial authorities.
Terrorists always have the advantage of surprise.
Police forces collect information to be used in a public court to get people convicted. Security services gather information that does not necessarily lead to people being prosecuted and in many cases needs to remain confidential.