We do not know, in most cases, how far social failure and success are due to heredity, and how far to environment. But environment is the easier of the two to improve.
“Could we have prevented in 100% certainty? I don't think anything is that certain. However, we would have had a very, very good chance for preventing it.”
“Each social formation, through each of its material activities, exerts its influence upon the civic whole; and each of its ideas and ideals wins also its place and power.”