I've never been sure what drives a person to anonymously send someone threats of violence online. It's not acceptable to hurl that kind of abuse in the street, so why online?
At least now this horrible and illegal behaviour might become easier to report. Big internet companies such as Twitter are thinking of introducing a ‘report button‘ instead of victims having to fill in a long form.
Hopefully measures like this, combined with more court cases and convictions, will make nasty people realise the internet is still part of civil society and that the same rules apply.