What a horrible way to come home. I'm so sorry Neil.
I have never understood the urge to destroy something for the sake of it's destruction. I would never say that my children would NEVER do that (since that seems a sure way to make it happen), but if I ever found out they did.... ooohhhh... there would be some serious reprecussions. The least of all being that they repaid for the damages.
Again my sympathies on the damages, and I hope they find out who was responsible.