> what if the code you write or autonomous machine you contribute to used for killing?

This line of thinking, that creating machines that kill is unethical, will destroy the West. If the US wasn't so good at producing killing machines in WW2, you wouldn't be here to complain about DARPA ethics.

Instead of having engineers develop the most advanced machines for killing (i.e. protecting the West) such people go into producing the most addictive content delivery systems, destroying the brains of minors.