The sponsors of terrorist acts against European countries should be told two things.
First that we are much better prepared to prevent. The attacks by lone individuals, with very modest means, show that at present it is much more difficult for criminal groups to plan and organise terrorist raids. The intelligence services are now much more efficient than a few years ago. Exchanges between these types of individuals have become better monitored. Surveillance is more sophisticated.
Secondly, the sponsors should understand that these isolated acts do not change the way we see public life and do not split our societies along sectarian lines. We respond by continuing to lead routine lives. We carry on. The terrorists might kill innocent people but they have no lasting impact on our democratic values and institutions. Furthermore, they do not generate c continuous state of social panic and entrenched fear. The effect on society is local, and short lived.
A terrorist is a loser.