But can anything be done about it? It is as though these people know how to use the laws to circumvent sanity. If Europe is anything like here, the radicals found their ways in the legal professions.
Good question. Personally, I think the only thing that can be done about it is the expulsion of all Muslims from Western lands. That was what Spain finally had to do, after having permitted them to remain in Spain after the fall of Granada and even to have their own communities and cities. But the Muslims never ceased plotting ways to take over Spain again, and they even launched terrorist attacks on the civilian populations of Christian areas. Finally, more than a century after the fall of Granada, all Muslims were expelled from Spain, and while Spain continued to fight Muslim agression in other parts of Europe, at least Spain itself was free from this curse.
Practically speaking, however, I'm not sure how this could be accomplished. Aside from the fact that Europe is too aged and underpopulated without the Muslim immigrants to be able to support itself, there is the problem that it would now be impossible to expel people who were citizens of European countries. Personally, I think we should take the attitude of Islam itself, which says that the Islamic Empire trumps any regional alliance, and simply follow through on it. Islam is both a political state and a religion; well, in that case, Muslims have a place to go. It could be any Islamic country, preferably the one from which their parents originally emigrated, as long as it's out of Europe.
But clearly such a thing could never happen, and I honestly don't know what can be done. As you point out, the laws that might have protected the rights of Europeans have been subverted by the legal profession - the European legal profession, that is.
Europe, or at least Germany, is exactly the same in that respect. If you take a stand against these folks, they'll be screaming 'discrimination' or 'defamation' and drag you before the courts. In fact that is the professed goal of the organisation to which this airport worker belonged- using legal process rather than terrorism to achieve the same Islamist ends.