I can see from the rapid replies that are being put up here means that this is a social problem, not so much the actual plane it's about people living in a stress induced world for all sorts of reasons.
As has been mentioned here already these clowns will most likely get caught as this is not an everyday occurrence & someone will say something & the cat will be out of the bag but that doesn't solve a thing really as humans have perfected the art of monkey see monkey do!.
Will it happen again? Most likely. How do we handle it? Ah now there's a whole other subject that is starting to show thru meaning discipline or lack thereof from an early age where respect for other people & their property has long since been diss-guarded. You can see it in the eyes of school kids, no respect & no power to the educators to deal with it, who do we blame? OURSELVES!
Wmk2