OK. You don't agree with the OP's "arbitrary lines", I don't agree with the OP's arbitrary lines, I still don't understand why you felt you needed to attack me for this. But I hope you have a lovely day.
There is an is-ought distinction. We can reason, investigate, and speculate about the ancient Roman people and their distinctiveness and what populations today have the closest genetic distance without there being any implication whatsoever socially or legally.