It is a common fact that life expectancy is 70 years. That's old and gray is it not? The most common reason for death in the young; car accidents, not genetics. You use the word most very liberally here.
75% is a majority. So what is the percentage of babies being born psychopathic?
My def. of healthy babies; not having any disease at birth. I have not heard of any up rise in birth defects.
I think the point of the previous post was that most genetic problems get stopped naturally by miscarriage at the fertilized egg stage, before a woman even knows she is pregnant. She just has a late period, not realizing that was a fertilized egg with a defect.
(Isn't that what many religious people say when a woman has a miscarriage of a baby she wanted? It was god's way of preventing a baby with health problems from being born. Of course the same people say that if the baby will be born without a brain and will only live for a few hours, or is even already dead, she is not
supposed to have an abortion...)
And, since we now have the technology to save babies born at younger and younger stages of development (like 6 months gestation, or even earlier) we are likely to see an increase in birth defects. Some of the interventions that save the babies (oxygen, steroids) actually cause later health problems.
Some of these problems will show up early and others may not show up until much later in life. We do not have tests for all these problems, so we find out when the kid is 10 and can't read, or when the person is 25 and can't concentrate well enough to hold a job.
Yes, the environment is very important, but how our bodies and minds react to the environmental factors is often due to inherited characteristics. For example, many people smoke, but only some get cancer. Many people are abused as kids, but only some become violent adults. Many people drink or take drugs, but only some become alcoholics or addicts. Genetics factors may even determine which soldiers in combat are going to get PTSD and who won't.
Life expectancy is an average figure. It already takes into account the fact that childhood leukemia, sickle cell, and other conditions will make some people die before they get old. We are increasingly aware that genetics plays an important role in how long we live, and what our quality of life will be.
Genetic tendencies may explain why one kid in a family turns out to be a psychopath, and the others with the same upbringing, food, pollution exposure, etc. are normal. Someday there may be tests for that; as I said before, it will become an ethical problem as to what to do with a person who "tests" as a psychopath but has not committed any crimes. Yet.
In the litigious US, I see future lawsuits brought by victims' families against the people who "knew that he had tested positive for psychopathology and did nothing about it..."