I was in the cemetery the other day and a thought crossed my mind about the existence of an afterlife. It was not whether one existed or not, but what would humanity be like if we knew? How do we define our actions or even decide them? What is the affect of impulse?
There are 3 options to an afterlife, once we remove the need for a deity (with one there are 27 options): 1. it exists. 2. it does not exist. 3. it exists but is not a human normal conception of an afterlife.
Option 1: an afterlife exists. How do we proceed as a society?
As such it can be resonably assumed that if an afterlife existed and it was free of the constraints of morality/religion that it would consist of chaos. Rules would just be laughable. There would be no consequences, so why even worry about them? This is Nietzscheian Nirvana. Do whatever you wish and there are no repurcussions at all.
Option 2: actually this condition would support Nietzsche to a further extreme. Zero consequences. No question of them ever existing. One would be free to act as one wished at all times.
Option 3: Humans would most likely establish some sort limited morality system. It would be akin to hedging bets. Some things would be "taboo" for no other reason than chance would be against them for entering an afterlife.
In the end, Nietzsche was more brilliant than given credit for and knew that one's actions really were responsible only to the individual. Morality was a human construct and constructs in general were void. If rules exist, one should not consider them and just be.