During WWII the US was freeing the world from oppression; now it's more seen as the oppressor. The side you're on is pretty important (as it was during WWII).
This is even more true in the case of drone operations and so-called "AI" assisted actions, where operators sitting safely in air-conditioned facilities in the California desert can decide to remotely kill people with no risk to themselves.
I very much understand why a normal Google employee would prefer to have no part in that. Google understands it too, since it actively tried to keep the deal secret and minimized its impact when it became known.