It's all BS.
THe FBI (along with the NSA, and all the other government agencies that illegally spy on citizens) wants another convenient back door into iOS and they're trying to publicly shame Apple into providing it. They don't deserve crap based both on their reputation for ineptitude and illegal spying, and also based on the fact that this opens an inherent hole into iOS that can and will be used by entities that are just as dangerous as the FBI and NSA.