I realize that "it's only a car" but it's my car & nobody has the right to damage what I work hard for in life!
As Grant says, the majority of these vandals are jobless with no future what so ever & when they see something that is beyond their reach, they damage it out of shear spite! Some times we have to take things in our own hands because the justice system here in the UK is bo**ox & the police do not want to no about car vandalism.