Honestly, this could happen at any company, for all the same reasons - in my experience, any workplace that isn't actually, or at least run as if it were, military is rife with subpar physical security.

And I can't claim not to be part of the problem - I'm forever wandering off to get coffee without locking my screen, holding doors for people I kinda think I might recognise... every security sin you can name, I'm guilty of it at some point. And so are you. Yes, you. No, probably not you, Mr. Schneier.