From my observations, a large contingent of the employees at Google are fairly progressive on the political spectrum, at the very least, even those on the economic right tend to be of the anti-interventionist libertarian stripe, and not in favor of building weapons to further a military empire.

My guess is, you'd have a hard time getting people to explicitly work on something whose purpose is to kill people. Now, something like a self-driving car could certainly turn into a self-driving unmanned combat vehicle, but I bet the Google X people would be pretty horrified if that's what it was used for, as they are trying to save lives, not take more.

Someone else asked if Google is different than Lockheed Martin or Boeing, and I'd say, the answer is yes. Those companies are steeped in the defense contractor business and make a huge chunk of money by selling weapons to the military.

People often accuse Google of being an "advertising company" and look at where we get our money to find our motivations. Well, if you consistently apply that logic, our interests would be in getting you to watch more cat videos, and Boeing/Lockheed's interests would be in the world needing more weapons.

You can't simultaneously accuse Google of being "only an ad company", while at the same time accusing it of being interested in the military industrial complex, where it receives almost no benefit or revenue.