So your saying if someone wants into my Mercedes all thay have to do is bump into it and the doors will unlock
There's a couple of years' models of Volvo and Ford where if you want it all you have to do is kick the right part of the bumper.. And then slice the airbags out, admittedly.
There's another Ford where you can get underneath, rotate an electrical port blanker 180deg and the locks will pop..
Certain Vauxhalls can be made live (ie, to be bump started) by putting the hazard switch in upside down, too.