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This is a really touchy subject for some people because a mishandling of the situation can cause major problems. It was always a problem for me growing up, actually, because I was often the "victim" of my brother's antics, be they theft, harassment, or otherwise, but anytime I would attempt to call my parents to take care of the kid and keep him from causing problems, I would inevitably get blamed for "leaving myself open" and my parents would continue to take no action against my brother. Strangely, when I started solving the problems by crushing my brothers spine my brother was not blamed for being a poor combatant.
Ultimately, though, both parties really are at fault, in a sense. What's important is not whose fault it is, but whether or not a "legal" crime has been committed. Stealing someone's car is always theft and the criminal should (probably) always be punished accordingly. This does not mean that you do not need to lock your car doors or secure your car in a garage or keep your keys on you so criminals don't gain easy access. Doing so would be a "natural" crime.
See, "legal" laws are something we make up to protect each other from ourselves, from things we can catch so that they don't continue acting, and sometimes even undo the damage that has been cause. "Natural" laws, on the other hand, are things that exist regardless of what we say about them. We cannot (or, at least, should not) punish anyone or anything that breaks these laws, because nature itself will apply consequences to any misbehavior as necessray.
Imagine a different scenario entirely here, wherein someone left their food in the back of the fridge for four months. Now it's all moldy and inedible. Whose fault is that? Well...the mold, obviously, and theoretically the mold should be held responsible in a court of law. The fact remains, though, that if the victim had not forgotten about their food (broken a natural law) this would not have happened in the f