I suspect the Virgin programmers thought passengers would be smart enough to understand this and thus refrain from being dicks on a plane.
Unfortunately the kind of people who abuse these systems also tend to be the dumbest kind of people as well. In the UK a recent problem is Brexit supporters sending rape and death threats to MPs. Many of them do it from their own or their work’s genuine email address then are flabbergasted when the police come knocking on their door to arrest them.
‘Stupid is as stupid does’ as Tom Hanks once said.