When you say it's not in the best interest.

That depends on what you prioritize as a person. You would need to expand on that.

For Example, I don't prioritize things in terms of what's in the best interest of black people.

That's because I cannot speak for all black people. That's because I do not have the same passions as all black people.

What you are saying in my view.

Is that ethnic groups are top-down pyramid structures.

That some group at the top tells your ethnic group certain rules. Then everyone in that group follows the rules because it's in their best interest.

I see ethnic groups as a flat structure. There is no what's in the best interest of the group.

That's a top-down model. A flat model operates more of a decentralized format. What's best for each individual.