“Wiener declined an invitation to join the Manhattan Project. After the war, he became increasingly concerned with what he saw as political interference in scientific research, and the militarization of science. His article “A Scientist Rebels” in the January 1947 issue of The Atlantic Monthly urged scientists to consider the ethical implications of their work. After the war, he refused to accept any government funding or to work on military projects.”

I found these paragraphs on child-labor to be thought-provoking (taken from John Taylor Gatto’s An Underground History of American Education):

“To mention just a few other radical changes in children’s book content between 1890 and 1920: school credentials replace experience as the goal book characters work toward, and child labor becomes a label of condemnation in spite of its ancient function as the quickest, most reliable way to human independence—the way taken in fact by Carnegie, Rockefeller, and many others who were now apparently quite anxious to put a stop to it.

Children are encouraged not to work at all until their late teen years, sometimes not until their thirties. A case for the general superiority of youth working instead of idly sitting around in school confinement is often made prior to 1900, but never heard again in children’s books after 1916. The universality of this silence is the notable thing, deafening in fact.”

Gatto does mention elsewhere in the book the horrors of child labor in dangerous work (like coal mining), but child labor in and of itself does not necessarily mean unsafe, immoral, etc…