No problem at all. Even the next 10 phones would be from dead perps or jailed convicts. But all that evidence will be tainted since Apple is not LE trained. Either perps or terrorist conspirators walk on that tainted evidence or the FBI demands the SW to use themselves. The next step is obvious, since that's what they do all the time now on Android and other such trash (I own an Android phone). This is a great time to draw the line, no compromises.
Hypothetical......how many lives is it worth? 14? 100? 1,000? 100,000? Your own children?
The feds just want the contact information.
I hope Apple loses millions and millions in sales over this.