Earlier quoted context omitted.
Europe has learned the lesson that extremists are bad, but it has not learned the lesson that the tools shouldn't exist.
There will always be extremists on both sides of the political spectrum. The problem is quite simple: people swing more to one side or another if their voices are not heard. The current boogeyman is the growth of the far-right in Europe. But that could have been prevented if the EU did not have an open-doors migration policy to start with. And to have listened to the people on other issues too.
I wouldn't even mind if they would be honest about what they claim (being nationalist), but I don't see any right wing party talking seriously about programs to encourage natality, reduce poverty or improve education. Blaming a generic category for your problems rarely solves said problems.
So, for me the boogeyman is talking about superfluous generic topics rather than solutions to problems I see: education, natality, energy, industry.