Inspired by Software that helps, except I disagree with Bertil's implicit assertion that all software is helpful in the long run :) The development of the atomic bomb is the classic example of how diffusion of responsibility through a team and/or management structure helps people rationalize working on all kinds of stuff. Likely none of us have reached the ethical depths plumbed by Oppenheimer and his team, but what aren't you proud of?

I worked in advertising for a few years, making it easier to waste paper and annoy people worldwide with those mailers from car dealerships you throw away without looking at. I'm never working in advertising again.