>No problem with doing good investigations, but all existing research says that very few accusations are false, but also that very few rapists ever pay for their crimes.

All true.
But false accusations can and do happen.
Nothing as serious as rape, but I was accused of stealing $18,000 by a cop.
The cop was in fact the thief - stealing from his business partners and his wife.

If all it takes is an accusation to destroy someone's reputation, then we are all lost.