And I have yet to see a single paper like this where a researcher bails out and publicly says they refuse to work on such projects. Not one.
The most benign interpretation of this observation is that science is filled with spineless opportunists who don’t care who they hurt with what they create. A slightly less benign interpretation might be that many of these people are doing this deliberately, and getting off on the sense of power it gives them.
When it is pushed from the top it is hard to stop at ground level.
That’s irrelevant for the moral evaluation. Everyone is responsible for their own actions. If you choose not to kill anyone it won’t stop others from killing. But the fact that this is so doesn’t give you a license to kill.