Ron Arkin might also belong on the list.

From Robots at War: Scholars Debate the Ethical Issues:

“I was very enthralled with the thrill of discovery and the drive for research and not as much paying attention to the consequences of, ‘If we answer these questions, what’s going to happen?’” [roboticist Ronald Arkin] says. What was going to happen soon became apparent: Robotics started moving out of the labs and into the military-industrial complex, and Mr. Arkin began to worry that the systems could eventually be retooled as weaponized “killing machines fully capable of taking human life, perhaps indiscriminately.” 

Arkin went on to write one of the better works of "mainstream machine ethics".