just make sure you give them a good enough kicking the first time and they wont come back.
few year ago we had gangs of kids targetting our cars ( had two XR2's and a XR4x4 on the drive) ended up giving chase and pinning one against a wall telling him and his mates to fuck off. just fueled the fire, they came back, stole, damaged, vandalised, all sorts till one night me and my dad beat the shit out of a pair of them, finally stopped! words do no good, prison doesnt scare them, so just go ape shit at them.