All the dangerous mass killing gases, G.M. Bacteria and Viruses and other devices, weapons etc. are developed by some brilliant scientists. The politicians just only use these.
Even today, such researches are going on in different laboratories of the world. Many brilliant scientists selected such profession for a handsome of salary etc.
The scientists are dedicated in their works. They may have the feeling that they are only liable to their employer and science, having no responsibility for use and effects of their discoveries.
What is your consideration?