It's easy to throw around ethics but many people don't think that far ahead and saying "we shouldn't make weapons" is naive and dangerous when the rest of the world already has them pointed at us.
I think the potential negatives with this technology outweigh the positives.
AI isn't only used for drone strikes, and more accuracy in means a better outcome in actually hitting the target while preserving the lives of innocents (and thereby ending the conflict quickly and reducing the chance of eventual retaliation by other groups). We can always launch more attacks if we have more targets to destroy, not just hope the drone randomly blows things up during its mission.
There is also no offense or defense, they are the same thing when talking about weapons. Having the best weapons and never using them is far better than being unprepared when someone else comes along with more capabilities.
“If someone’s going to do it, it might as well be us” is about the extent of corporate ethics.
The spying on citizens part is pretty entrenched, I don’t see any candidate running on a platform of not doing that.