@Butrflynet,
It’s got to take some amount of effort to slash a tire I would have thought. Whoever’s responsible in my area made a concerted effort.
Here’s an ABC clip about tires and their shelf life that wound up in my inbox just a couple weeks ago. I never worried about it before, because I thought I was buying new, but evidently car tires can sit on store shelves for many years before being sold, and pose a serious risk for blowouts after about six years. It was a real eye opener. Scary.
http://abcnews.go.com/Video/playerIndex?id=4826897