for me its like a cycle, bad things happen and someone feel like they have to take that pain on the one who caused it, or another. For the most part though, it depends on if they actually did the crime their commited of, and what they get for their crime.
though we do have crooked people all over the court system, sometimes mistakes are made, and sometimes its done on purpose. Its not really fair to put someone behind bars if it was in self defense, or accidental. thats something that cant be avoided, so they should get a punishment, just not of a high caliber
however if someone gets away from the crime they commit, that isnt fair to the one that has been done wrong. They should have some kind of punishment, for an evil if not disturbing crime, and their punishment should be on the highest level
though i will say i dont like my taxes going into something if its for the wrong reasons and people of that crime and punishment