I mean, if you were going to leave a box containing $30,000 on your doorstep. A box not only containing 30k, but a box that was labelled that it contained 30k. How would you protect it? Put a serial number on it so you can prove it's yours? A bike lock? A motion sensor? Cement it into the ground?
What lengths would you expect someone to go to, to try to walk away with this box? Just give it a little kick to see if it moves? A screwdriver or a pry bar? Angle grinder?
Once you divorce yourself from the commonality of a car, it's quite bizarre to think that not only do most people leave their second most valuable possession (or most valuable, if you rent your home) on their doorstep .. but that they just assume it won't happen to them. It doesn't take a targeted attack for someone to realise that that exposed, valuable, mobile asset is .. well, exposed, valuable and mobile.