Logic and scientific evidence stand behind each statement listed above.
I have just a couple of comments.
1) How does one measure intelligence?
Harvard's Howard Gardner wrote about multiple intelligences. He started out with seven and now its up to nine. His original seven intelligences are: Linguistic, Logical-mathematical, Musical, Spatial, Bodily Kinesthetic, Interpersonal, and Intrapersonal. My comment is that I have met many people in my life that lack logical-mathematical intelligence, but have other areas where they are superior.
2) Position in life does not reflect intelligence. I have had many bright students that performed poorly in my courses not from lack of intelligence, but from the lack of motivation. I feel that motivation and hard work are more important than intelligence for success.
3) From the original comment, "At the present time, we are evolving to become less intelligent with each new generation. Why is this happening? Simple: the least-intelligent people are having the most children." it could be implied that the original homo sapiens were more intelligent than we are now. At what point was the human race at the highest level of intelligence? How does one quantify that? What statistic does one use? Literacy rate? I do believe that a larger % of society is literate than in the past. Post-secondary education? I do believe that more people attend post-secondary institutes than in the past.
This comment reminds me of the extintion of the .400 batting ave myth. The idea that baseball players were better in the past than now. I feel that the late Stephen Jay Gould ideas he wrote about in
Full House would match up with this discussion. I would definitely read it if you are interested in this topic.
In conclusion, my fear of the future is that logic is being displaced by myth & emotion(much like the dark ages) and that we are less motivated as a whole than we were in the past. As far as the eugenic side of it, one can have a map to a destination that doesn't mean they are going to get there. One has to have the desire and the intestinal fortitude to make it there.