They are definitely not stupid, they just have to adapt to the current situation. And the situation is that the stagnating economy and the skyrocketing inflation meets overly high expectations of the youth. It is a high-income trap we live in (everything is kinda fine, but you see the huge tsunami rolling towards us), which should in theory lead to political changes for the whole society to move on. Speaking about Germany, this would particularly make sense now, right now. But unfortunately, political changes are notoriously very hard to enforce.