Could you first maybe drop a letter to the house stating that unless this crap stops you will be forced to place the avo? It might make you feel a bit better if this kid has a choice iykwim?

On the other hand, could you maybe set up a camera, or even a dummy camera at the front of the house so this little bugger can think twice.

I'd feel a bit bad too - but not if the kid had been warned and I was losing sleep and worrying about protecting my home/children.