Thoughts
One of the things about me that is interesting, and perhaps a flaw, is that if the Nazis hired me to make bridges I would make them the best
bridges that I could. That is not the say that I want the Nazis to succeed, or that I don't care, or that I would be unwilling to sacrifice the life of a Nazi for the greater good. And it's not to say that I do what I'm told to the best of my ability. But I do think that a good bridge is a good thing, even if it is used for evil purposes. And I wouldn't want to bring a bad bridge into the world even if it served to take a Nazi out of the world.
If this were not a hypothetical I would likely refuse to build the bridge at all.