No, some Americans don't. Some of my fellow countrymen are so self-absorbed it doesn't even cross their mind their actions might impact someone else. You'll also see people opening their doors into traffic on very narrow streets.
It's also such an easy and appealing gesture. It's a bit like drawing your gun out, you like it when you do it swift. Just reading the article I was thinking "aww noo, I can't tickle the handle and swerve out like a cat anymore. ... but they're so right I can't win"
