A good article.
Unselfish acts of kindness are not limited to members of the blood line. Indeed, they appear mostly between non-blood related individuals. Most common between man and wife. In regards to soldiers. there is no doubt that a very small minority may embrace such ideals. However, the great majority are either ordered (or else) or have been victims of mass propaganda (brain washing) to do it. There are also the psychopaths that don't need motivation to commit horrible acts against fellow human beings.

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