i hardly think a purpose is required. i'd like to agree with whoever it was (don't feel like looking up and checking) who mentioned the nature of morals and of moral judgements of existence in general. the fact of the matter is that humans aren't any different than anything else, we aren't any different, in practical terms than the mold spores everyone seems to be mentioning.
and remember that diseases are a necessary part of any ecosystem. so what if humans are earth's disease. everything has an achille's heal. otherwise, nothing would work properly. it would throw out the concept of survival of the fittest. though i have my own thoughts on that and its relationship to humanity. someone can start a "what makes us human?" thread and i'll comment there.
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