I want to add a caveat: The side winning the war has discretion to retoactively qualify actions as war crimes. A case in point is the Nuremberg Charter: The killing of the people in Lidice (now: Czech Republic) in 1942 was legal under German law; though the action was considered a war crime in Nuremberg 1946.
Hitler failed to be elected president of Germany then – he was considered too extreme(1932: 30 %). Even the NSDAP (Nazi-Party) never gained more than 44 % of the national popular vote.
Apple’s credibility would also be destroyed if they relented. Plus building a masterkey – which would be the result as Apple claims – could violate EU Data Protection laws that can (beginning 2018) result in fines of up to 2 % of the worldwide sales.
I want to add a caveat: The side winning the war has discretion to retoactively qualify actions as war crimes. A case in point is the Nuremberg Charter: The killing of the people in Lidice (now: Czech Republic) in 1942 was legal under German law; though the action was considered a war crime in Nuremberg 1946.