And maybe, if software does good, we have an ethical responsibility to deliver software more cheaply and quickly, (and if it doesn't then maybe we shouldn't write it at all)? Ethics are complex, even more than programming, and you're not going to get a definitive answer to such questions. Rust makes certain choices -- more control, more accidental complexity -- as it targets certain domains, while other languages target other domains and make other choices. It's your responsibility to figure out which domain your application belongs in, and neither ethics nor anything else can give a universally applicable answer here.