So, the US DOJ has in hand an exploit which allows them to access protected data on an iPhone, access that Apple and the phone's designers clearly did not inten

So, the US DOJ has in hand an exploit which allows them to access protected data on an iPhone, access that Apple and the phone's designers clearly did not intend to be allowed. Ethical behavior would have the US DOJ describe the exploit to Apple immediately so that the flaw in the system can be repaired. Publishing the exploit in publicly available documents would speed Apple's efforts to repair the fault.