This premise about large subsets falls apart when you apply it to maples and oaks, even less it's applicable to free willed creatures gifted with intelligence. If you see a difference between two subgroups, it means your understanding of why these groups are the way they are is lacking.

I literally have no idea what you mean. But if we see that, for instance, average life expectancy is markedly lower for the subset of population that identifies as "native American" vs that of those that identify as "white", that's clearly an inequality of outcome that there's reason to be concerned about. Which isn't to say it mightn't turn out to have a genetic basis that leaves us with limited options to compensate for, but it's surely worth ensuring better understanding the causes and doing what we can to ensure there aren't systemic barriers preventing particular subgroups from accessing the same degree of medical care etc. available to others.

Maples and oaks are different species. Humans are all the same species.

Men and women are the same species, yet they are markedly different in many ways.