We might add, "How can justice be achieved through a system that is intentionally adversarial?"
In the English-speaking world, most of just presume a legal system based on a State prosecution and a criminal defense that are adversaries only loosely refereed by a neutral magistrate.
But actually, our system, which grew out of English common law, is not the only way to do things. In much of the french-speaking world, for example, prosecutors and magistrates are often the same person at the same time. Trial judges are not neutral referees; they're active participants in criminal cases, charged with enforcing the law with an eye toward achieving justice.
How this works out on the ground with sexual abuse cases, I don't know. But it's probably worth looking into.