Great thread.
To answer the OP, I think it's broader than White folk being shook of Black rebellion, because they leave out all the anti-Black white riots and coups too and that shyt comes with the exact opposite energy.
First off, I think there is zero energy from a White Supremacist system to cover anything that prioritizes the situation of Black communities. Slave rebellions are ignored because they didn't succeed in overthrowing White power. White riots are ignored because they targeted Black communities whose fate is considered irrelevant to modern White people. Things like the slavery/Civil War and the Civil Rights Movement are basically the only time the issues of Black folk are prioritized and then only because the outcomes directly affected the status of the White community a substantial degree. That which isn't primarily relevant to White people is disappeared.
Second, there is a need for those in power to push the idea of constant progress. If any Black community was relatively free at some point, and then was put back under subjection, if any Black people rose up against their rulers and then fell back, that would imply that things actually got worse than before, and that can't be allowed. For that reason we basically never talk about free Blacks in the Revolution-era days (perhaps 1-2 prominent figures but never the communities as a whole), we flip through Reconstruction and primarily focus on the White "carpetbaggers" and "scallywags", we ignore the Black centers of culture and finance of the early 20th century. If we admitted any highlights, admitted any meaningful attempts as self-actualization, we might have to admit that the USA frequently became LESS free and LESS committed to good than it had been before, and we don't want to acknowledge that shyt.