It does not.
Every action taken by a human is done out of selfishness.
If a soldier jumps on a grenade to save his platoon he is not doing it for them but for himself.
In the soldiers mind the thing he desires most in that moment is to save his platoon so his action is driven by that desire to get what HE wants.
Every human being on the planet who is capable of rational thought makes every decision based on selfishness.
PLEASE ALLOW ME TO CLEAR THIS UP FOR YOU!
Humans only do anything and everything they do for only two reasons or both, TO GAIN SOME KIND OF PLEASURE FROM IT, OR TO PREVENT SOME KIND OF PAIN BY DOING IT.
We could argue this all day, but if you can think of any exceptions to this rule, TRUST ME, I can give you an example that backs up the rule to this phenomena.
Now yes, people are naturally selfish in many ways, but not everything they do, or do not do, are selfish acts.
Many acts come from assuming self-responsibility, through Bravery, Guts, experience, Intelligence, and Conscience, to do the right things, when the right things need to be done.
Many people have a better understanding of responsibility than others. Many people do think of others, and not just themselves, before they make personal decisions about what to do, and what not to do, in any given decision.
A lot of this has to do with how you were raised, and the examples you were influenced by, and followed throughout your life. We have all had both good and bad examples that we personally chose to follow- OR NOT FOLLOW for ourselves.
Not everyone understands what sacrifice even is, the importance of it, or where, or when it needs to be applied. But, in this world, just about everything we do, or do not do, will most always come with some kind of a personal sacrifice. And yes, there are some people that will never sacrifice anything ever for any reason, and that does come from ignorance, selfishness, and FOLLOWING OTHER BAD EXAMPLES.
It also has to do with with personal commitment! Some people can make commitments- and some people refuse to commit to anything, and if they do, it is in their own self-interest.
Weak men only think of themselves- Strong men always think about others first as part of following the Golden Rule!
Weak men do not commit themselves- Strong men do.
Weak men are not willing to make a sacrifice- Strong men are willing to make a sacrifice.
Weak men do not play by the Golden Rule- Strong men are committed to following the Golden Rule.
Weak men do not think or care about the consequences of their actions or non-actions- STRONG MEN ALWAYS DO!
Next!