Earlier quoted context omitted.
Members of our government are so indoctrinated about stopping "terrorism" that they have lost all sense of perspective. In this case, it might be better to assume malice rather than incompetence. In the 1950's it was s/terrorist/communist/, but it was a remarkably effective political tool. We might be in the same situation. But this time, our fates are all linked. Once shipping backdoors becomes mainstream, it might…
Most people I've met who work in security at large companies would rather lose their job than participate in the erasure of security for all. Apple showed this pretty obviously, but I think many companies would have most of their software engineers quit before accepting such a request, even if it was a direct order. The government cannot order you personally to write software, that's blatant first amendment violation…
While I think (and hope) this is correct, I'm not sure it matters.
For example, it would not be necessary for most of the engineers to be aware of a backdoor or other known vulnerability. There have been examples from open source crypto where malicious code has weakened it significantly and still nobody noticed.
There's also the very real possibility of baking the backdoor/vulnerability into a custom ASIC design. Chances are the government has a lot of expertise in this area and could simply tell Apple that it would provide one of the parts for all iPhones and the part would behave to spec (but would contain other undocumented behavior).
I think it's also realistic that other governments do this. Unless a chip is manufactured using the latest microprocessor-level miniaturization, it could contain all sorts of undocumented circuitry. I'm not sure about the economics of this sort of attack, but surely it makes sense once in a while.