Those who harass students, as far as I have observed, either do not get punished at all or are so lightly punished that it appears that they get off scot free. Indeed, at one stop along my travels, I was told "they let us screw the students" as it were a perk. And at that place, a predator was given special treatment by the blind senior faculty, creating such a poisoned environment that one had a hard time cracking down on academic offenses.
So, when I see folks worrying about false accusations (poli sci rumor sites), I am flummoxed--how can the ranks of the falsely accused be so large that neither my friends nor I have met any of these folks?*
* Sure, it can happen, but not with great frequency.
This mythology is not only disturbing but destructive. That women (it always seems to be about women who make false accusations according to the fearful) are excluded from meals or drinks because they might "get the wrong idea" is harmful to their careers. They don't get to participate in as much networking because of the fear of fearful men who worry about false accusations (I do fear that some folks use this fear to justify excluding women). There is a relatively easy solution--if one is that worried, invite more than one student to join you for lunch or for a beer at a conference.
I really have never worried about my grad students accusing me of anything. I treat them with respect, and they thus respect me. Working with undergrads can be a bit more complicated so I would drink with larger groups of them at the end of a term. Again, no problems--respect breeds respect. Fear, on the other hand, leads to anger and all that the little green guy asserted.