Experiment as a way to be rid of a race?

I thought that the idea that Angela brought up in class about the Tuskegee Experiment as a way to be rid of the African American race was an interesting one to consider. They never gave any of the men treatment, even when a successful treatment was available. If they had wanted to watch what syphilis did to the body, wouldn't they also want to know how a treatment affected the body as well? It seemed to me that they wanted to see how the disease affected the body as well as see how many African Americans would die in the process. With the racist thinking of the time, I'm sure many of the doctors and scientists involved weren't all that sad when one of the men in the experiment died. They just wanted to make sure that they would get the body of the deceased.