Your intent is unimportant. The simple fact is that you don't intend to fly one of the tickets.
That extra seat which you take out of inventory to better assure that you make it home that night means that it's not there for someone who does abide by the rules and that guy gets stuck overnight.
Or worse, WN figures that lots of people double book and WN overbooks and then starts playing the VDB game at the gate. So, more people double book and WN overbooks more and so on.
It's not sustainable. Now that people know that the game is over, they will adapt.