It's because circumstances in the United States regarding how the government interfaces to the world are getting dangerously fascist, and people in the tech sector are sensitive to the risk of repeating the history of IBM and the Nazi party (i.e. enabling a government's ability to commit atrocities at scale).

It's an open question how much responsibility one has regarding how one's technology is used and what services one is providing to whom. There isn't universal agreement on the topic, but there are plenty of software engineers who believe "more than zero," and quite a few who believe they have more responsibility than that.