I don't think anyone should ever be allowed to walk if caught committing a crime. If less kids were given a slap on the wrist for their teenage nonsense, we'd have fewer adult criminals. We're WAY too lenient on criminals.
As for stealing animals, that's a different story. A life is clearly in danger, even if not human. Would I personally shoot someone to save a snake or a dog? Uh, no. But some people are more passionate about animals than I am. When I use the word "property" I mean inanimate objects, not a living anything.