Because Android permission model is junk and at least it's getting a rethink in M. Which will be relevant sometime in 2016 on part of Android device base but at

Because Android permission model is junk and at least it's getting a rethink in M. Which will be relevant sometime in 2016 on part of Android device base but at least it's something. Honestly, if someone would be paranoid and wouldn't install apps based on those permissions, you'd be left with the stock phone.