I'm sorry, but you just have no idea what I'm talking about.
In Denmark, bikes are a serious, very widespread and very usable means of transportation. You can go anywhere on a bike. Everybody has one, many have more than one. People use them all the time.
I know, from personal experience, other's experience and conventional wisdom, that a bike is almost useless in most American cities. The infrastructure is not at all planned with bikes in mind. Therefore, there are hardly any bikes to steal, and nowhere to go on them, once you have stolen one.
Therefore, the amount of bike theft is quite high in Denmark, compared to other countries, just like there is more car theft in America than on Mars.
People steal bikes just to take on trip a few miles, then throw it into a bush (I've had two bikes stolen within the last 6 years). Noone would steal a BMX to take it to a contest, which seems to be your main impression of what a bike is used for. Not compared to the amount of "use and throwaway-theft" we experience over here.
This also fits my personal experience pretty well. I was trapped (is the right word) in Nashville, TN for a month with only my feet and a bike to get around on (oh, and public transportation...ahahahaha!), and everywhere I went people looked at me with an expression that clearly said: "Aww, how cute! He's using a toy as transportation outside the playground!".