I'm not worried at all. Flying random drones close to airports is such a lame attempt to scare people. What's the goal here? To test response times in Europe?
In my opinion we just need some counter drones around European airports. I have seen police use drones that capture civilian drones with a net or something similar. Shooting the drone down in an airport would do more harm than good unfortunately.
They also mention it on the wiki page but I could see fractals and different patterns when I closed my eyes while on shrooms.