Biden should be held accountable for excesses of the Drug War which he supported, but Kamala Harris was Attorney General for California and as such it was her job to enforce the law. Kamala Harris did strictly enforce the law, but also provided many with options to avoid punishment by staying employed and not reoffending.
At this point hypocrisy in politics is pervasive so it is important to be specific about what people did or did not say or do.