I don’t understand your point. Is it okay that cancel culture exists because it was “invented” by white conservatives? Does the fact that black people have endured horrific mistreatment justify the continuation of the practice?
Who cares who started it? It’s either a problem or it’s not. This short-sighted focus on figuring out who to point the finger at, rather than trying to solve problems, is why progress happens so much more slowly than it needs to.