That would be even worse than computer game griefing, taking things to a real life level from a game is just beyond silly and I'd question the mental health of anyone that did that.
I suppose there is a kind of logic to it, I mean its a game, just like any other game that a person might play.
For example, Chess is just a game too, but if I was playing chess and someone just decided to knock all the pieces off the board there would in all probability be consequences. Likewise if I was playing football and someone burst the ball, or if I was playing tennis and someone kept jumping in and whacking the ball over the court, there would quite possibly be repercussions. Its cause and effect if you like, someone acts like an arse to someone and there is the effect that the person gets some form of comeuppence. The big advantage of the internet of course is that its totally non-physical and anonymous, and as history has shown people tend to behave in the worst possible ways if anonymity is involved.