You haven't seen shit. Criminal family clans have an estimated 200.000 family members in Germany alone. This source is leaning extremely to the left so you can't accuse me of using bad sources:
https://www.zeit.de/2018/33/clans-deutschland-kriminalitaet-...
Police have formed extra divisions for this and it's a huge problem in at least a dozen big German cities.
It's the same or worse in Paris, Marseille, Stockholm, some English cities and probably others I forgot.
Saying this problem doesn't exist only shows how uneducated and ignorant you are.