A source of anger and controversy is the act of merging onto a highway. There’s a battle between who has the right of way and who should get out of the way.
What would you do? What would you do if your neighbor's yard was covered in dandelions and weeds, and needed some help, but hadn't taken care of it yet?
Whatever the reason for the rage, the main thing is to not act upon it, but some people can't control it and will sometimes cross the line with their road rage.
While there is no stopping people from using this offensive hand gesture, it is safe to say that it is being used far too commonly, especially by children.