This picture is from the June 2007 issue of Bicycling magazine, p. 37.
If you look carefully, you will see that it shows a "Bike Boulevard" with a cyclist riding in the door zone. If someone in that green VW Beetle suddenly opened the door, the cyclist would go down. Note how he is riding along the right edge of the big huge "Bike Boulevard" symbol.
I was just talking to a guy this weekend about yet another dooring incident. He had blood spurting out of his neck, lost over a liter and spent a few days in the hospital. If the injury had been slightly different, he would have been killed. Yet, when I suggested this is why it's important to stay out of the door zone, he immediately replied that he was out of the door zone. He started talking about how far he was from the cars, but stopped when I said five feet. Even after his crash, he had no idea he had to be that far to be safe. When I explained it to him he was genuinely surprised. He had never done the math (door opens 3.5', your right side is 1 foot to the left of your tire, and add 6" buffer/margin of error, and your tire must be at least five feet from parked cars). When most cyclists reading Bicycling look at this image, they will probably not think that the cyclist is too far right. It won't occur to them. And it won't occur to them when they themselves are riding that close to parked cars.
What can we do change bicycling culture to understand this better?