It's not the key problem here. The key problem is still the omnipresence of real sexual harassment and assault in the workplace. Yes, false accusations absolutely do happen, but they are the exception not the rule. Ask yourself, what's the remedy for false accusations for any crime or any wrongdoing? They do exist, ranging from social: the presence of exculpatory evidence or the lack of corroborating stories establishing a pattern of behavior to legal: lawsuits for defamation of character or libel/slander.