They didn't have to avoid any reminders. They were most likely just asked "how" it could be done, not to do it. The law comes into effect now, where the FBI is trying to get the courts to order them to comply. Simply telling someone how to potentially do something illegal is not illegal itself, and really doesn't cross any boundaries in my opinion. A white hat hacker uses many of the same techniques that a black hat hacker uses, but in one instance it is legal and in the other it is illegal.