These cases are difficult to prove.
As I said to a guy I know about this, who was ranting about how these women should be locked up....what would he say if his daughter came home and accused a guy of groping her, but couldn't prove this beyond reasonable doubt. Would he support her being jailed for making a malicious accusation? His response was that he would go round and knock the bloke's teeth out....
I suspect what has happened in a lot of these cases of celebrities is that in times past powerful men had quite an easy ride in taking liberties with women and some have behaved in quite an obnoxious way and harassed women. However none of these men should be convicted of an actual crime, without evidence beyond reasonable doubt. That doesn't mean they didn't do it, it means you err on the side of not sending an innocent man to jail.
In practice these men have suffered a lot now because mud sticks with this type of offence.
There's another wider point about guilt in the court of public opinion. When an accusation of improper sexual harassment takes place, like it or not people form a subconscious opinion over whether that person is likely or not to be guilty based on their character. This is where men that engage in racy or suggestive 'lad banter' can end up being falsely accused of things. I remember being at college where we had a lecturer who was a bit inappropriate. A week in to term I mentioned that I had a friend who was interested in enrolling but as it was a week late wasn't sure if she could join. He was like "its a girl yeah? that depends....is she hot?". He was about 40 and he would be talking about a 17 year old girl. I kind of laughed this off but I did think hmm this sounds dodge.... then a few times in class he would make 'banter' with the 6th formers about stuff like "taking one for the team" or "its like going to Ibiza and scoring and then waking up next to her the next day and thinking what on earth is that???". Most of the guys just thought this was funny. But then there was an accusation that he had indecently assaulted a girl. Immediately, especially amongst the girls in our class, he was pretty much thought guilty and I have to say even though I had no evidence, I thought hmm....it wouldn't be out of character would it. I remember the college speaking to people from our class asking had he behaved inappropriately before, and people were dobbing him in for his banterous comments. He ended up getting suspended. I do wonder whether he was found guilty on the evidence of him acting in a bit of a pervy way for a 40 year old, which is a totally different thing from indecent assault.
But it did have an effect on me, in that after that I've always been very careful about what sexual banter I do, even in jest, because if you create the impression that you're a bit sleazy or creepy, you never know what could happen to you if a false accusation is thrown round.