> There's also nothing wrong with cars which don't pop the lock back open if the car is off and the key is in the ignition, except that when such a technology exists, is pretty cheap / easy to implement, and can save users potentially a lot of trouble, why would you not implement it?

If you drive an armored car, then you wouldn't want the doors to automatically unlock whenever you put it in park. An ICE agent was killed three years ago in Mexico because of this feature.

http://www.washingtonpost.com/world/the_americas/armored-suv...