The new iPhone has a fingerprint scanner and some people are already complaining that this isn’t good decision of Apple in this “NSA here, NSA there” times. Perhaps it’s really not a clever idea from the PR perspective. However you have to do a threat analysis. What’s more reasonable and more dangerous and damanging to you. The fear that the fingerprint (most often the sensor don’t deliver a finger print but something like a hash code of the print) may leave the phone (you leave 1000 copies of your finger print a day around you just by grabbing stuff anyway). Or thieves, friends preparing a prank or your significant other just following the grease traces on your phone to find out the unlock code (which you don’t need with a finger print scanner)?