In many cases, I don't think you can separate "people" from "the system" because the system is a human construct in which human discretion is called upon repeatedly. For example, studies which show that young white children react more negatively to black faces compared to white faces - is this "the system"? Is is it "discretion"? I'm not sure you can differentiate the two.
It's also important to note that just because you fixed a racist practice, that doesn't immediately endow an underprivileged group with the full fruits of equality. For example, redlining may now be illegal in the United States, but middle class white Americans have been benefiting from nearly a hundred years' worth of wealth accumulation through housing that black Americans were locked out of. This is a good example of how the "system" produces racially-biased outcomes without any racist human input in the present day.
It's also important to note that just because you fixed a racist practice, that doesn't immediately endow an underprivileged group with the full fruits of equality. For example, redlining may now be illegal in the United States, but middle class white Americans have been benefiting from nearly a hundred years' worth of wealth accumulation through housing that black Americans were locked out of. This is a good example of how the "system" produces racially-biased outcomes without any racist human input in the present day.