I generally agree with the rest of your post that SF has become a crime-ridden hellhole, but how do they know so quickly? Are they omniscient? Did they have Bob under a scope (if so, why did they not interfere)?

If they really had Bob under a scope for some active intel interaction and some well placed source in the US intel community started talking about this outside (no matter to how close a friend), that someone is going to lose his access, his tongue or his head very quickly. And knows it.