Please, please read the information out there.
...what the FBI is asking is for a tool to crack the phone's encryption
Apple are NOT being asked to crack the encryption, nor to provide the FBI with a tool to do the same. They're being asked to develop and install a modified version of the OS that will only work on that specific handset. It should prevent the phone destroying the encryption key after 10 incorrect attempts (rendering the information on it useless), and will also allow repeated attempts to brute force the unlock code without applying increasing delays between each attempt. The software can remain in Apple's possession, and there is no demand to provide it to the FBI to use.