If there were clear and transparent -- like public -- procedures -- by which the FBI could get into an iPhone, it might be alright. Say that if they broke into the iPhone it was indelibly marked -- it flipped a flag in the hardware and there was no way to disguise it, and the OS would broadcast it over the web and over BlueTooth and WiFi, making it easy to provide tools that caught the message and published it. Then people lose their privacy, but only if the government is willing to defend in a credible way the necessity of it.