Which doesn't mean people aren't getting shot and blown up, it just means I'm not closely involved with it. My stance is not beating people over the head with morality, it's purely personal and self-centered. It helps me sleep better at night when I'm not building tools that directly spy on people. I'd like to be as many degrees removed from that as possible, really. Don't take my post to mean that I'm prescribing this morality onto others.
We could do a Six Degrees of Kevin Bacon that proves that my work actually does lead to pain, death, and suffering throughout the world in a convoluted and indirect way, and it may in fact be true - but I don't think it's a stretch to say that there is a large moral difference between directly working on something with ill effects and being far removed from it with no intentional contribution.
Side note though: I don't buy this argument that we can't condemn things unless our hands our perfectly clean. The fact that we all are products of war, suffering, and other terrible things does not remove our ability to steer the ship forward.
You might find this interesting: https://gist.github.com/zmaril/5326884
TL;DR: if you've contributed to open source in some way, you've probably given Palantir the tools they need to do their work.
Software developers are generally no more responsible for the misdeeds of others using their software than anyone else that produces almost any kind of tool.
There's no way you could ever realistically prove your position (ditto the parent).
Of course creating a credible second strike ability is so easy ( merely hide x weapons with delivery systems controlled by PALs ) that it has been a solved problem from the 1960s.
(I do not have an opinion on the morality of working for Palantir.)