I have a doubt about Marzal (I don't know why but it reminds me of the candy known as "Marzipan", hehehe). If their only population is made of only black people, Wouldn't that mean that the only criminals that live there are black too? Another interesting point to mention is that if the people of Marzal have lived centuries there without any kind of contact with other cultures, Wouldn't they be more intrigued to meet other non-black cultures? I don't mean they have to meet only white people but other cultures.

It would be boring to lack any kind of diversity.