I think what is being lost is that despite Google having lost its morals at various points, and Don't Be Evil being burried, this man's resignation does signal yet another dark turning point in the future of the Google organization.

They are now openly partnering with war industries and the government to assist them in doing things like bombing a school full of girls, killing hundreds in an entirely indefensible war of aggression.* This is a very dark red line to cross and despite Googlers being wealthy and privilaged, it is nonetheless a significant protest that deserves to be heard on its own terms. Ideally, a protest would change policy at the company.

Google management: Stop cooperating with the immoral and illegally operating War Department!

* I don't have evidence Google directly participated in the Minab school bombing, but this is the side they are supporting.