how about beat their wife? get drunk and drive? not pay their taxes? drive without a seat belt? OK, so you only want to do it with murder. What a great system, we can arrest 9 people, threaten them with life in prison, when one of them makes up a plausible story(with the help of LE) the others go to jail, the govt looks great, and one guy walks away after a hand slap.
Are you sure that you really believe what you wrote?
If someone makes a plausible threat to beat up their wives, I think we should arrest them. We do have laws about threats and intimidation, and I think it’s reasonable.