If you own a garage then yes, that would say you didn't care if someone stole it. If you cared about someone stealing it then you would put it in the garage where it would be safer..
Don't get the logic? Make I have to spoon feed you people to make you understand. Alright.
Let's say you brought the car outside from garage, and you realized that you forgot some important thing inside your home(which takes a few seconds or minute to bring it back). Do you take time to open the gates, open the garage, park it inside, close garage, go inside room, get the thing, come back, open the garage, bring the car outside, close the garage and close the door?
Yes, it doesn't matter how you try to explain it. The simple fact of the matter is if you don't want something stolen then you would protect it. Doesn't matter if its a car, money, house, possessions, you name it.
If you are too lazy to take the extra minute or two to store your car in the garage then you run the risk of having it stolen. There is no logic involved, it is all common sense.