SAN FRANCISCO—Speaking at the Noisebridge hackerspace Tuesday evening, Chelsea Manning implored a crowd of makers, nerds, and developers to be ethical coders. “As a coder, I know that you can build a system and it works, but you’re thinking about the immediate result, you’re not thinking about that this particular code could be misused, or it could be used in a different manner,” she said, as part of a conversation with Noisebridge co-founder Mitch Altman.