To be fair, cystic fibrosis isn’t curable, either.
And, if you have a limited supply of funds, going after childhood cancer (which affects children of all races) will save more lives than trying to find a cure for sickle cell anemia.
But funding is only one issue in solving sickle cell. It is a genetic disease, and a cure would require serious advances in gene manipulation.
Read the STAT article here: https://www.statnews.com/2016/05/19/sickle-cell-disease-cure/