What is riding responsibly?

http://www.grist.org/article/2011-01-18-what-does-it-mean-to-ride-a-bicycle-responsibly

"Biases also tend to color our perceptions of what is and isn't dangerous. Seeing someone on a bicycle in traffic can seem alarming no matter how legally or safely that person is riding, especially if you can't imagine yourself doing such a thing. But the devil you know is always more appealing -- and the 100 or so car-related deaths and many, many more injuries that happen in our country every day have come to seem so inevitable and mundane that most of us don't think twice about climbing into a car and setting off towards the freeway."