The context here is a video game, which I won't name as it'd be a bit of a spoiler, but the relevant part of the plot is: The deuteragonist's boyfriend was guided and goaded to suicide by one of the antagonists, who gave full details on how to end his life, how to obtain the materials, etc, etc, etc. The story took place in England, but I'm looking for general viewpoints that would apply to multiple jurisdictions.
The deuteragonist went on a quest of vengeance, rather than seeking legal recourse. My question is: Had she been able to positively identify the person who did this, would he have been able to be charged with a crime? Or alternatively, would she have been able to sue him in civil court?
All the materials used were completely legal (I'm not 100% sure if the physics and chemistry actually work, but I'm not asking about that). There were significant difficulties in identifying the person behind the user name, which constitute a significant portion of the game's plot, but if there'd been anything definitely illegal happening, it would have been possible to bypass a lot of that via a subpoena to an ISP. But if what he did wasn't illegal, then the next question is: what is the legal status of a vengeance rampage against him? I suspect she may possibly have been opening herself up to some serious criminal charges.