Why Capitalism won't let a Black revolt—or any revolt—to create change that is significant. to gain civil liberties.
Capitalism thrives off of the existence of two classes: The working class and the privileged class, the oppressor (bourgeoisie) and the oppressed (the proletariat).
It benefits off this in many ways: Divide and Conquer. Dividing, of course, the classes. A divided society is much easier to control and oppress , as well as to exploit. This way, the classes and subdivisions of said classes will fight amongst themselves, taught to fight for individual rights and liberties -that the system should be providing with in the first place- instead of the rights and liberties uniting the collective of the oppressed class.
This, of course, is no mistake, this helps the bourgeoisie control the masses ( the proletariat ) ,because the «working» class is far greater in numbers than the rich or privileged class.
Capitalism works off of a power structure that puts in control a very small group of people that is in charge of power distribution, through economic, social and political means. This very small group of people controls the fates of the «majority» of the population, which is the «working» class.
The problem with this is not clearly evident: when you have a group of people in control of the fates of the majority much or any revolt to create change that is significant much, much, smaller than the people they are ruling over, this group will serve their own interests, not of the majority. Their interests obviously are oppressive and damaging to the working class, because their interests mainly lean towards profits, profits, for them, of course. And profits for them means suffering for the majority, because by putting profits first, you are placing everything else as secondary importance; that meaning human rights and liberties, proper working conditions, proper wages , gender equality in pay, racial equality, enforcing equality in general in all shapes or forms, etc..
This is why Capitalism will eventually destroy itself, by making wages lower, working conditions worse, and hiring immigrants and using cheap labor, as well as replacing jobs with robots or computerized systems, eventually, the "supply and demand" chain will crumble when the majority of the «working class» is too poor or unemployed to consume the goods and services that Capitalism *needs* to survive on. Which will lead to one of two things;
A global economic catastrophe or a working class revolution.
Which leads me to my first point: 'why a Black Revolt or any minority oppressed group revolution wouldn't seek to achieve any significant change in a capitalistic system'
This wouldn't work if you still seek to stay in Capitalism, because Capitalism *needs* classes and groups (especially minority groups) to oppress, to give low wages to, to be unemployed so the privileged class people can get the job, to have class inequality so that can be exploited through false or bad help organizations that "help" the poor class without ever actually doing so, and gaining massive profits in the promise of helping. Capitalism for these reasons won't allow black liberation and equal rights, LGBT+ equality, liberation for women, because Capitalism *needs* to have a class that is suffering. It needs a bottom up hierarchy that purposely exploits and puts down the bottom class so the top class can receive benefits.
So, knowing this, we can say that any fight for equality will be in vain under Capitalism. Take out Capitalism, you get rid of a system that reaps off of oppression.