Actually it's illegal to lock the housedoor, because of emergency situations. In case something happend and the people need to flee, they could be trapped in the house.

Also technically it's not illegal to leave your car door unlocked, Police just handles it that way. The law demands that the car cannot be misused.

It's not illegal to lock your house door, that's only locks that require a key to unlock from inside. Normal deadbolts are fine. You just can't lock people in.

Example here http://www.ahouseonarock.com/chesterfieldhomeinspector/doubl...

People have used these thinking "Someone could break the glass, reach in, and turn the deadbolt to open the door," but it's really not worth the trade-off of "My house is on fire and I can't get out."

I didn't know that. Is it possible, then, that a person who leaves their door unlocked is punished while the person who stole and dumped the car is not?

Wtf, no. The person stealing the car is of course punished as a thief. (Unless he doesn't get caught, obviously.)

And is that not a classic case of victim blaming?

It is victim blaming, but some countries obviously deem that acceptable behavior, to the point of putting it into law.