I too quit a job that made a significant pivot to weapons R&D. It was a hard move, and honestly I still haven't recovered from it. I don't regret the decision in the slightest though.

One aspect that sticks with me was the sheer excitement of a lot of people in the room, engineers excited to be working on new problems. I believe many didn't consider the consequences of their labor.

As a worker it can take time for it to sink in that the products you are actively working on are being used for immoral/unethical purposes. I've also noticed a perceived weakness when expressing these types of views to colleagues, responses either masked by apathy or just direct justified destruction of lives along patriotic or ideological lines.

Its worth bringing up these stories whenever appropriate I believe, people sometimes _need_ a jolt even if the probability of success are low.