Xbox 360 BioShock2: Do you understand the end?

[Pickicool]

I know there are many purposes, but I did not understand.
If someone could explain to me?

Anttention the spoilers, but some end, we will die of the Eleanor hand. But why?

Which one is the right end? What's going on?
I remember that the 2 conclusions from the first Bioshock was very simple and perfect.