Because I thought that the name "Black Dragons" being used was probably not just a coincidence.
Kinda like the rather unusual (compared to the rest of Sirius) amount of racism/xenophobia didnt seem like just a coincidnce.
Or maybe its a case of a similarity of a name/nature of a societey ending up in somethin that I found very similar to a particular idiology, which are suposedly unlinked and all moot.
Like... you know... something that was thrown into he game (name black dragons and secret society) ending up in something that also ending up like something that reminded me of what it also influenced back then in the first half of the 20th century.
Coincidence, intentional, or a case of history repeating through human psyschology and a certain mindset.