The big issue never really addressed by Cyborg was the plague that destroyed the world. So we are delving into the backstory regarding the plague, that it creates a zombie of the infected, that Mary (Terrie Batson) was the first prophet series cyborg and she was the cyborg – “Tama Prophet”- created to spread the plague (Mary being the Typhoid Mary of the 21st Century). In Cyborg, Pearl Prophet (Dayle Haddon) was created to spread the cure so its an interesting juxtposition of purposes I think.
Fender and the other Slingers were mercenary black ops soldiers working for a Halliburton type corporation and volunteered to become cybergenic. They were the Slingers and created to be immune to the plague and to further the corporations interests.