Conspiracies and conspiracy theories are two very different things. The reason people scoff at conspiracy theories is because they are often times wrong and/or vague. How many *verified conspiracies actually started as a 'conspiracy theory'.
Let's be fair, if I told you that a UFO cult led by a sci-fi writer performed a massive infiltration of the US government (the largest ever detected) in order to whitewash itself in official records you'd have thought I was wacko before Operation: Snow White came to light. The same UFO cult also had a number of their agents insert themselves into the life of a journalist who had written negative things about them in an attempt to get her to either off herself or be institutionalized, dubbed Operation: Freakout which was only uncovered in the aftermath of the discovery of Operation: Snow White.
With Tuskegee, the conspiratorial claim is often made that the men were deliberately infected. They were “just” not informed of their infected status and discouraged from seeking medical care elsewhere. This meant that they often ended up infecting their families.
I understand Black conspiracy theorists who have elaborate claims about Tuskegee - it was such a monstrous action and violation of trust that it is difficult to balance not minimizing it with being clear about what did/did not happen.
i can conspire with some people without someone else theorizing about it. "conspiracy" doesn't mean "a conspiracy theory that graduated", no matter how much tinfoil hat wackadoos want it to.