The driver was born 50 years after Hiroshima. In Tokyo, a city leveled by fire-bombing raids that killed 100,000 civilians.
We fought hard against them, they fought hard against us.
But!
Japan and the USA signed a peace treaty, ending hostilities.
We trade with each other.
We each consider the other an ally.

And what does bombing Hiroshima have to do with winning the Indy 500? Takuma Sato came over here and drove. Obviously, he isn't bothered the fact we dropped the Bomb.