Of course you can ask individuals directly working on such stuff to make that decision. Implementers (who are aware what they're implementing) are just as much responsible for it as the people who gave them directions. In fact, this is just a rehash of the "just following orders" defense, except in this case it's not even orders, since you can walk out on them.
Not only that, I seriously doubt that Google would punish anybody who would simply request to not work on that particular project, instead of accommodating them by reassigning to a different team. So this is a very low bar to clear.
Does it mean that somebody else will do it? Probably, but responsibility matters. If you're the one who assists in illegal or unethical activities, then you're personally responsible for them.
Not only that, I seriously doubt that Google would punish anybody who would simply request to not work on that particular project, instead of accommodating them by reassigning to a different team. So this is a very low bar to clear.
Does it mean that somebody else will do it? Probably, but responsibility matters. If you're the one who assists in illegal or unethical activities, then you're personally responsible for them.