Killing people is at the extreme end of ethical concerns, but a lot more people are working on code that's designed to tighten corporations' control over users or otherwise take away their freedom and privacy and increase authoritarianism. Things like DRM, "security" ("because who doesn't want to be safe and secure?"), removing functionality that allows extensibility/interoperability, etc. I've heard it phrased thus: "Do we want to help them build better nooses to put around our necks?"