NEO, the purpose of dreaming, to my knowledge is unknown, but whatever the reason the phenomenon is a complex one. Most people do not recall their dreams upon awakening but there appears to be others who retain vivid memories of, if not all their dreams, then most of them. The mind itself never sleeps and remains continually active and in this process, at maintaining this activity, it latches-on mainly to emotional events in the dreamer's life but there are other features that are not readily recognisable. One of those being the occasional psychic input often revealing itself as precognition. Another is a kind of inner-self which tries to communicate with our conscious mind through dreaming. It is as if that 'nice person' inside of us is trying to keep us on the right path through life but mostly it does so through the universal language of allegory. Paradoxically, few people today understand this language although our forebearers of antiquity understood its meanings. One should be reticent to dismiss dreams simply through the lack of understanding their purpose. In addition to having a biological requirement they also seem to possess a social one. Anyone ignoring the message in dream does so at their peril, the caveat which is higlighted in Carlo Collodi's wonderful tale of 'Pinocchio' the genesis of which arises from folklore of centuries past.
In answer to your second query; take a look at the wild life of nature and the one thing that readily becomes apparent is the number of creatures that prey on other animals which is all part of the food supply. Any animal that is likely to be a prey is unlikely to put trust in others. We too are animals and among us there are those who prey on the vulnerabilities of those who are socially naive, and this includes a vast number of this type. The irony is, that those types can easily and readily rationalise and justify their behaviour and most are social survivors. Personal security is like charity which should always begin at home and with one's self.
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