Online campaigns like these have helped radicalize a broad swath of Germany’s youth, making extreme-right ideas that were once relegated to the margins of German political discourse increasingly mainstream. The Young Alternative, the AfD youth organization that put out the dance video, has been classified by Germany’s domestic intelligence agency as an extremist group since last year.
If the EU's indiscriminate immigration policies weren't so lax, and didn't create issues for the general public, such things wouldn't happen. It's not the young who failed to study history, it's the institutions who failed to learn how to appease the population. It's easily seeable, the far right is winning in all those places whose population wad most affected by the idiotic idea of "Let's just let everyone in, but let's not help them in any way, shape or form so that they need to resort to crime". Many states saw a surge in criminality because of illegal immigrants, especially in Northern Europe. That's why the far right is winning.
Your explanation is worthless but thanks for the example of exactly the kind of social media content that lures children to the right. Let's just hope they grow up and learn to see the difference between contrarianism and wisdom.