I Hate Football

Our apartment is very near to the stadium and last weekend during the game my bicycle helmet was stolen. I was upset, but not too much because I hadn't locked it up, so it wasn't so surprising, despite the fact that it was oddly colored and child sized. However, what I realized later as I rode my bike to work is that someone stabbed my tire with a pocketknife! Why would anyone do such a thing? The impulse to steal I can understand, but I cannot understand the anger behind random destruction.