We almost certainly have 1,000 Einsteins and 1,000 Mozarts alive today. A relevant quote from 1979:
“I am, somehow, less interested in the weight and convolutions of Einstein’s brain than in the near certainty that people of equal talent have lived and died in cotton fields and sweatshops.”
It’s a very good relevant XKCD.
The title text is more directly applicable: If you ask “why are leaves green?” the usual answer is “because they’re full of chlorophyll, and chlorophyll is green,” even though “why does chlorophyll scatter green light?” is a great question too.