From my perspective, I'm looking at it in a non-emotional logical way.
IT is 100% right on this.To get revenge by sending her to jail rather than killing her or something similar..?
You are implying that a crime of passion can be prevented by creating an alternative "revenge". This would need some evidence to support it.
I have serious doubts you can provide support because people who kill their spouses are not in a logical enough state to sit back and say "**** it! I can just send the bitch to prison. I won't cut her labia off and wear them as a hat! Thank God for the legal system! Otherwise that bitch's twat was going to be a fedora!"