During WWII the protagonist's parents are shot by Germans after a body of a collaborator was found in front of their house. The parents were arguing with the soldiers about something when arrested and ended up shot during the arrest.
The collaborator was shot by the resistance in front of their neighbours house, and the neighbours moved the body in front of the protagonist's house.
Over the years, he encounters many people involved in this event, and starts seeing things from many sides. One of the themes that's explored is who bears moral responsibility for his parents' death? The Germans for shooting them? His mother for arguing? The neighbours for moving the body? The resistance for shooting the collaborator? The collaborator for collaborating? All of their actions were a necessary link in the chain that lead to their death.
One of the characters utters a simple and powerful way of dealing with that morality: "He who did it, did it, and not somebody else. The only useful truth is that everybody is killed, by who he is killed, and not by anyone else."
It's a self-serving morality, because the character was part of the resistance group that shot the collaborator in a time where reprisals where very common. But it's also very appealing in its simplicity and clarity.
I find myself referring back to it, in cases like this. In the imagined future, where this tech is used for Bad Things, who is responsible for those Bad Things? The person that did the Bad Thing? The person that developed this tech? The people that developed the tech that lead up to this development?
I'm much inclined to only lay blame on the person that did the Bad Thing.