If the alleged facts are indeed true, it is incredibly difficult to even manage to get the police to care, let alone act. Not to mention the social stigma and the trauma.
Given the number of people involved, other people might be compelled to come forward. Then we will know for sure.
You can't really believe it is that easy. Filing a police report is, in most countries, an excruciating exercise in frustration and humiliation for women victims of harassment. It carries social stigma on a level that is astounding. Add to this the level of gaslighting usually deployed by abusers and you have a recipe for self censorship.
While I generally agree with the fundamental idea behind your statement that you should generally let the justice system do its job, you've still got to put your statement into context. Said context is that a very tiny fraction of depositions of sexual nature even reaches actual charges, and even fewer actually end up in convictions. The justice system is, objectively speaking, utterly failing at protecting people against these crimes.