I think it's hard for a lawyer, who has to say things like "If I understand how it works" before speaking about a topic, to understand that it is infeasible to

I think it's hard for a lawyer, who has to say things like "If I understand how it works" before speaking about a topic, to understand that it is infeasible to create a system which is both secure in general, and insecure when the government wants something. These changes are likely in response not only to public distrust in institutions like NSA, but also to existing general threats to the security model of previous iOS releases, which like any system with a backdoor, have the potential for the backdoor to be used nefariously.