Earlier quoted context omitted.
I'm not sure how that's obvious? School isn't where I learned about the Tuskegee experiment, so why would I assume that's the primary way people learn about it? That's a claim that actually needs some data to back it up.
I think this is pretty straightforwardly what any social scientist would expect, but if we must have data, see Figure 4 of https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3221924/#!po=29...
And statements like that are why I don't trust any social science without digging a few layers deeper than the data that's initially presented.