Observe the fate of the possum and learn.
Once upon a time, in a land not too far away, there was a road. This road was very long, but very narrow, and it ran through the country with traffic going one way.
On the left side of the road, there lived Left Side of the Road Possums. Some lived just beside the road, some lived further away from it, but all considered themselves proper Left Side of the Road possums.
On the right side of the road there lived Right Side of the Road possums. Some lived just beside the road, some lived further away from it, but all considered themselves proper Right Side of the Road possums.
Occasionally, a Left Side of the Road possum would decide that things were better on the Right Side of the Road, and he would set off across the road to become a Right Side of the Road Possum.
Sadly, most didn't make it for they were run over in the middle of the road by cars and trucks whizzing on their way. Those that did make it, found that the Right Side of the Road Possums never really accepted them, or trusted them, believing that they were not "true" Right Side of the Road Possums.
Occasionally, a Right Side of the Road possum would decide that things were better on the Left Side of the Road, and he would set off across the road to become a Left Side of the Road Possum.
Sadly, most didn't make it for they were run over in the middle of the road by cars and trucks whizzing on their way. Those that did make it, found that the Left Side of the Road Possums never really accepted them, or trusted them, believing that they were not "true" Left Side of the Road Possums.
Sometimes, on both sides of the road, a possums was born and was accidentally dropped on their head. These possums were never quite "right" (or "left" if you prefer), and they yearned to live in the center of the road.
All of these possums are dead.
And the moral of our story is, "Pick a side, nature abhors the middle of the road".