If I understand your meaning, you are saying natural selection is very harsh and brutal. This is true, but just because nature works that way does not mean we humans have to live that way. We have safe, organized civilization to save us from that. But some say because of this, we are growing weaker.
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Yes that is my point we are growing weaker and weaker as we see, we always are fighting with new and new diseases. This could be because of loss of certain traits.. Like you said human selection is responsible for this loosing of traits which otherwise is not visible but does create an impact...