@Endus isn't supporting those racist laws, what he's doing is pointing out the difference - Harris worked within the system when she had to, as a prosecutor, and was so successful that now she is in a position to change those laws, which she has been working towards in her elected position.
Working within a system doesn't mean you agree with it. In fact, ideally it's the perfect way to make change - from within.
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You know what we should do, elect a hard-charging black woman with decades of experience in the system, who knows the problems that need to be fixed, and would be in a position to make those changes.