We shouldn't help other people simply because of striving for a better society without ego and selfishness, in my opinion there is more - We are all one and the same consciousness, experiencing itself through various points of views. This idea is backed by the fact that we are, in fact, all made of molecules. Not only that, but they are also the same kind of molecules. Also, the exact same kinds of cells and genes (excluding mutations, but even they are slight, albeit with catastrophic effects).
We are also practically mostly made of water, and it has been long-concluded by researchers that water is indeed sentient, as it has memory and reacts to emotional contact.
And so, let's say a molecule of water evaporates from one's skin, goes in the clouds, falls on another's skin as rain and gets absorbed by the organism. This molecule of water brings with itself the memories of its past hosts and exchanges information and then evaporates in one way or another to go to another host and exchange some more information etc.
Thus, we are all simply molecules that exchange information with one-another, being invincible in our atomic existence.
We are all the sons and daughters of the Universe, its' core and its' creation.
:)