OK, so imagine this. This is in USA. Robbery going on, camera warns the police department, they go on the scene, robber pulls out a gun, barricades themselves. Instead of a robbery, and some few thousand dollar damage (oh no, they took the jewelry, that is really really important because it is from gold) , you put police officers at risk, probably damage your house, maybe turn it into a hostage situation, maybe car chase, dead people. Nobody likes that. Besides, what's the point? Insurance will pay anyway.
There was this guy prosecuted just now. Someone was stealing his cucumber from his garden, so he wired up his fence to the 230V, thief died. Justice served, right?
But I know, USA is different. Every life is precious, except if it steps on my property!