There are 2 sides to this story, the first being the need for due process cuz in this country you're not supposed to be pronounced guilty until proven so, even in the court of public opinion. And the other side is the issue of sexual harassment and misconduct, which has to be appropriately dealt with. Is it fair to fire a guy cuz a female says he did this or that, many years ago? In some jobs like on TV (Matt Lauer, etc.) and politics, image is everything; just the appearance or accusation on impropriety can cause harm and so one can see the problem if a guy is kept on despite being accused of misconduct. And yet such charges can be used to retaliate against somebody or for monetary gain (lawsuit) when the accused may not have done anything wrong.
What if the evidence is insufficient to result in charges filed or a lawsuit brought? The guy gets canned anyway? What if it's true but years have passed and nobody said nothing until now when there's a certain amount of leverage cuz the guy has something to lose? Tough call for a woman trying to make her way in the world, if you speak up and accuse somebody of sexual misconduct then you're risking your job and maybe worse. So - no easy answers here. Case by case basis then, is there a 3rd person that can corroborate anything? Guys like that I would think tend to do that sort of thing to more than one woman.
In the case of Rob Porter, it seems pretty clear he was abusive to his wives. The second wife reported similar behavior that the first had. Sadly, most allegations of domestic violence are dropped prior to adjudication, not because they didn't happen, but because the woman is either intimidated or sweet talked into not going forward. In Maine, there is a law that there MUST be an arrest when cops are called to a domestic. That doesn't mean it will go to trial though. Despite all they can do, the Victims Witness Advocates can't get the victims to testify. Even Protection Orders, once taken, are routinely violated and dropped by the victims.
It is their husband or significant other. They LOVE him. Most of the time he's a great guy, provides for the family, remembers birthdays, yada yada. It can take a long time for women to get it that despite his apologies and promises, it WILL happen again, and the longer it goes on, the worse it usually gets. That's when deaths occur.
This stuff is serious. It is frustratingly difficult to stop, and one of the big reasons is that women won't follow through, don't believe they deserve to be treated better.
I agree with you that it would be better to have a hearing and an adjudication before allegations are taken seriously, but just like with the sexual harassment accusations, how often does that happen? We're in a different land when it comes to these types of allegations. People can't apply cut and dried "law and order" principles to them, because that is not the reality of the landscape.