Is there something at that Bullrun link that shows the USG uses legal methods (or even illegal methods) to force product makers to insert backdoors into their equipment against the product makers' will?[1]
The NSA inserting backdoors into the product without the cooperation or maybe even knowledge of the vendor -- while troubling for any number of reasons -- is vastly different. Especially when giving advice to developers about how to stay in bounds with the law. If the metagame becomes "the government can legally force you to insert backdoors into your product" any developer faced with this threat might believe it, when he should know it's bunk.
[1] RSA allegedly got paid $10 million to make a change the NSA wanted. RSA customers should demand an answer, but that's not forcing the RSA. People get paid to do things all the time.