Mandalorian Spoilers:
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My theory since the beginning of the Mandalorian was that Din Djarin was from a religious fundamentalist group of Mandalorians. I was glad to be proven right here. We know that Mandalorians in the past were in family clans and took off their helmets regularly. His creed of never taking his helmet off very obviously showed that Death Watch had evolved more as a religious fundamentalist group of Mandalorians. On another note there is some real world comparisons to the Jewish people here. It’s one group that you can either be ethnically, religiously or even nationality as an Israeli. You also have some breaks between the fundamentalists there and those who are more ethnically/culturally related. So I think real world Jews were the inspiration for Mandalorians much like past fantasy authors were inspired by other real world historical groups.