Rape is common actually somewhere between online and offline. Lots of young girls (and a lot of students included) are victims but who can stop them from going outside to meet strangers and acquaintances through online forums to be raped? Big social problem, but so far no good solution except to tell one's own daughters to be careful.
Trying to invade another forum member's home and kill or rape people there is not a smart thing to solve disagreements. There are many that threaten to do so but there's only one likely outcome: death penalty.
And so most people try something that won't get them to early tombs, the kind of physical violence that doesn't leave a hole or too much blood. Personally, I was attacked a few times, but usually the ones that actually use threats and violence are typical cowards that can't meet the eyes and shut up and get shy when confronted with honest words. So far, organized criminals aren't active on the internet yet but I guess it's just a matter of time.