A little while ago I wrote a piece on parallel lives and asked what effect the existence of parallel selves would have on consciousness.
Consider what would happen if consciousness could move between these parallel lives, making choices which might affect the course of the life of the self within individual parallel existences.
If we take the simple case, a binary decision point, then there are two choices, two outcomes. In many cases these decision points would not have a great effect upon the general run of things, they might simply reflect the slight differences between parallel worlds.
However, there will be decision points where the outcome is of extreme importance, for example the choice of stepping into the road or staying on the pavement. In one world the self chooses to step into the road and is hit by a vehicle and is killed, in another, the self decides to stay on the pavement and avoids the collision. In this world the self lives.
A consciousness faced with this choice is hardly likely to select the fatal outcome as a branching point continuation as, we can assume, that this could well lead to the termination of that consciousness. It is reasonable to assume that the consciousness would choose the self that survives. This being the case, the way is open for the conscious self to choose the more favourable outcome whenever there is a binary choice; so allowing the possibility for the consciousness to choose the better life.
In fact, when the choice is between life and death, the consciousness is bound to choose life. This could happen ad infinitum; whenever death is a potential outcome, life is chosen. Of course, other beings, if they exist, would navigate an individually beneficial path through this maze of choices, each oblivious to the choices made by other consciousnesses. We see others die while their consciousness follows a parallel path and continues to live, perhaps seeing us die.