What's being discussed here is not a revenge killing, you catch someone doing it you're probably not going to gun them down, you're more likely to detain, call police and press charges, or chase them off. But if they come at you with their hacksaw...
I think the proper solution to this is that car manufacturers should be required to better secure these things. Putting a thousand dollars or more in such an easy to access place, requiring people to have some of their money sitting there like that, might as well tie a bow around it and set it on the hood.
