drunkiq - thanks for the links. I went there and read the entires.
In response to the question "why" - people do let air out of tires. I live in Korea, and the Koreans generally do a couple things to cars to annoy their owners. First, letting the air out of tires and second, and far worse, the key scratch down the side.
Parking space in Seoul is at a premium. If you park in someones place, whether marked or not, you will find a flat or a scratch when you return to your car. In Korea part of the After Market Service is Scratch Repair 3 times a year. My wife's Lexus Dealership performs this service free of charge - but no loaner. I left my car out one evening and upon my return found someone played a game of tick-tack-toe on my hood. $500 later and one night after the repair a repeat performance. My apartment complex found out it was one of their employees - I apparently forgot to give him a Thanksgiving Day (ChuSok) Tip :evil: