It was a hypothetical and tangential case based on the parent comment, so let's get back to the original context where there is a more clear-cut conclusion.
When it comes to security, the accountability dynamic between personal investment in outcomes and the inherent detachment as an employee of a third party is a bit different than kitchen work, and significantly more important.
This arrangement works to the benefit of both Google and those responsible for securing the company.
Agreed I worked for large Telco and we had an office in Manchester cleaned out of PC's twice in year - turns out it was an inside job on of the outsourced security guards let them in.
I was involved in the replacement for the third time (we used all the old crap pc's we could dig up from across the company)
And given the high profile espionage that goes on in sv and tech having direct control and vetting of security guards makes sense.
Of course for the more secret squirrel side of the biz we always used different security - ask yourself when Bruce Scheier left BT note who he as very careful to be ltra nice to on the way out.
When it comes to security, the accountability dynamic between personal investment in outcomes and the inherent detachment as an employee of a third party is a bit different than kitchen work, and significantly more important.
This arrangement works to the benefit of both Google and those responsible for securing the company.