“Children are altruistic by nature,” he writes, and though they are also naturally selfish, all parents need do is try to tip the balance toward social behavior.
Quote taken from here.
History has shown a plethora of attempts to suggest education, rewards, drugs, or a combination thereof, etc. are all that is needed to produce acceptable behavior and among humanity to put an end to sin. Here's another approach, and this one is simply to "tip the balance" between the two (altruism and selfishness). Seems the world which fails to accept the Bible's position of both humans as image bearers as well as the need for a change of heart will always be trying to come up with something new, but to no avail, until man accepts that the the sinful nature of man cannot be solved apart from the cleansing and renewal found in Christ.
Therefore, there is now no condemnation for those who are in Christ Jesus, because through Christ Jesus the law of the Spirit of life set me free from the law of sin and death. For what the law was powerless to do in that it was weakened by the sinful nature, God did by sending his own Son in the likeness of sinful man to be a sin offering. And so he condemned sin in sinful man, in order that the righteous requirements of the law might be fully met in us, who do not live according to the sinful nature but according to the Spirit. (Romans 8:1-4)