Are we talking about justice, or revenge?

The difference between a criminal case and a civil one is simply this: In a criminal case the state must prove the subject guilty beyond a reasonable doubt. In a civil case, they must prove it by "A preponderence of evidence" Big difference. And the reason is quite sensible; if you are going to convict a person of murder, you had better be as certain as you can that he/she is guilty, because taking a person's life is not something to be taken lightly. On the other hand, taking his football trophy is not nearly as serious.
O.J. was not found innocent. He was found not guilty. I believe in the UK they say "not proven" which is closer to the truth.
It always amazes me how many "Christians" want the death penalty. The two simply do not jibe!