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Evolution does not work unless there is competition between organisms. What kind of competition is there today that is weeding out the "least fit" humans?(There's no great way of saying this when dealing with humans- but least fit is how it's described with other organisms)
But the real competition we face is with each other (some humans will thrive better than others - and not always in obvious ways). In that respect, society and technology do not mitigate that competition, but merely provide a context in which that competition occurs.
I completely agree with the fact that HIV and other powerful viruses/microorganisms do have potential to change the human gnome. In addition, to you stipulation that this would really on us NOT finding a cure, I would also like to add the condition that some humans would have to be either immune to the virus or at least less disposed to acquiring it. (Please tell me if this is true or possibly even if it has been found).
Also, can you please elaborate on the above quote. This is the aspect of the topic that I am not quite sure about. The only competition that I can readily observe is that of economic competition. This, however, is related to learned traits and does not posses the power to change our gnome.
I agree with this.. I myself suggested this to many people, but nobody seems to listen too much. Evolution is based on 'Survival of the fittest'.It's not quite that evolution STOPS with this, because the benign mutations still survive and continue getting passed on, it's just that bad mutations survive and may get passed on as well, so now evolutions going a bad way as well as a good way.