Why no 'diversity' in the Village?

No, the viewers are meant to assume this is a past time period. There wouldn't be various races in a colonial type village of the time.

You're an idiot.

because it would give away the twist

Because not everyone is a psycho, moron like you.
Only fascists idiots think the diversity of the entire planet must be forced into every little thing.
Only self hating westerners think moronic stuff like this.

You understand people are going to take this question seriously, right?

No, they were supposed to be european settlers, hence white.

No, they are not racists. They were acquaintances of each other and they happened to be white people. Had they had known or were friends with people of other colors/races who knew of what they planned but did not let them in on it, that would have been showing they were racists. But that was not the case.

Good point. Remake required.