The suicide act that girl was faking I would not consider remotely art -- more like a cry for attention. The guy who was doign graffitti and vandalizing -- that's harder. I personally view art as something visual that affects it's surroundings, and is aesthetic appealing. For example a painting, it changes the space it's in -- you put a painting on the wall, it's gets a revered status, and it becomes something to ponder over and gains attention (basically it commands a presence). The same is true of scultpure, landscape art, drawings/sketches and 3-D pieces; they have this aura that commands attention.
But one of the other things a piece of art must do is be appealing. Though it is true that the avant-garde paintings in German were "degenerate" and that in France Monet and the other impressionists were thought of as idiots by the thier Government, but in all cases you couldn't ignore the fact they were pleasing to the eye in their shape or form or colour or made use of one of the other elements of design.
This chick you tried to kill herself -- where's the composition, the line, the form, the colour, the texture? There isn't any! If someone had taken pictures of her when she was doing this, those I would could consider art.
With the guy who was doing vandalism -- we have a similar problem in Canada with graffitti. Most people I know will consider graffitti an art (eg http://imperfectangel88.deviantart.com/art/Graffitti-Le-Bonheur-56433817), but not tagging (eg http://blindedvisions.deviantart.com/art/Stop-Tagging-18409832). If he had stopped at that, I wouldn't be as pissed, but smashing in the windows was a bit much, I find it personally unartisitc not to mention rude.