Because, if you actually read the leaks instead of saying 'Yeah but, Snowden says everyone is spying on us?!', or even understood the technology that we're discussing here in the first place, then you'd understand that it doesn't matter what the government is doing because it is literally impossible for them to circumvent the OSI model without modifying every piece of network equipment in the world.
Why not address the exact point I made? You know where the firmware is compiled with a compromised compiler?
I'll explain the point to you in language you might understand: the firmware is compiled with the backdoor built-in. This is trivial to achieve and requires no modification as you claim. American companies were all co-operating, either enthusiastically, unenthusiastically or in some cases for money and and it has affected sales because of this. Most of the backbone of the Internet is built on American equipment i.e. Cisco whose sales are now affected by this.
This is before we get to Stuxnet which demonstrates the capabilities of American intelligence in the absence of co-operation. We're talking here about specialised industrial systems that were infiltrated and monitored.
But don't worry you bang on about the OSI model like you discovered something new.
