That's because the NSA does a lot more thorough background checks and has a nation-centered mission, while Google hires people relatively unchecked and of all nationalities and all over the world.
And in terms of abuse (i.e. LOVEINT), which strategy do you think has proven to be more sound? Hiring only good people, as verified by a thorough background check? Or hiring probably good people, and then using robust checks and balances anyway?
I know a bit about google's internal privacy safeguards (including how long they've been in place), and I know a bit (nothing that wasn't in the news) about the NSA's internal privacy safeguards from a certain point in time.
Obviously I don't know what it's like at the NSA today, but it's worth laughing (or crying) at the fact that there was a time when Google placed more restrictions and security in place to protect its users from rogue employees than the NSA did.
Not to get too political.