How big of you. If you keep taking baby steps like that one, and humans find a way to live forever, you could get there some day! I have faith.
You know...whatever differences there are between what were calling "races" are so negligible in the big picture of what makes us human, I think you're spending a large portion of your time on Earth worrying about something that's not that big of a difference. Instead of honestly considering why most elite swimmers are White or Asian, you've gone and blown it way out of proportion, like your chainsaw analogy. Which, frankly, is just goofy.
Ever wonder why Black boxers easily dominate White boxers? Is it because the races are so different and Black boxers are just way better...and that getting a White boxer to dominate in boxing (with a few exceptions) is like speed skating uphill?
Well...it's not. It has to do with opportunity and options. There used to be great fighters of Jewish, Irish, Italian descent. Some of the greatest of all-time. (I'm not talking about those who would not "Cross the color line" and fight blacks like Jack Dempsey.
If one took a look at real statistical data from 1970-2000, they would probably come away thinking that Black's are simply better at boxing, or their bodies are more adaptable to that sport. 3 decades of data.
And in the end...that data would mean nothing.
Just like it used to be poor Jewish/Irish/Italian boxers, fighting to get out of poverty, and then Black fighters doing the same, now, from 2000-2015 you can see a massive rise in Latin American contenders and champions as well as Eastern European fighters that dominate entire divisions. It turns out, those groups are also impoverished and that has more to do with why they were "tougher", more adaptable to the sport, have more "heart". When it's a fight to get out of being dirt poor, a person will do almost anything, including risk injury or beat the shit out of another person if that's what it takes.
Being so open minded and being open to changing your opinion, that swimming example can't be the biggest one that sticks out to you, is it? How about something more significant, where you had to challenge a very deep belief and you realized you were dead wrong.
I normally wouldn't challenge someone to come up with examples like these because people are uber resistant to changing their core beliefs, and it's all uphill. But you're one of the first people I've seen openly claim to be very interested in counter information and open to changing their mind, so I think it's fair in this case.