  Even if this picture of development is true, however, it does not defend psychological egoism, since it admits that we sometimes ultimately aim at things other than our welfare. An account of the origins of our non-self-regarding desires does not show that they are really self-regarding. The soldier’s desire is to save others, not increase his own welfare, even if he would not have desired to save others unless saving others was, in the past, connected to increasing his welfare.