Re: OM found murdered
Whether adultary is in the same league with rape/murder/terrorism, depends entirely on one's culture. I wouldn't likely murder my wife's lover (if she had one), not because I think it would be immoral to do so but because there would be no advantage to it. She owes me loyalty, he does not. Besides, murdering him wouldn't make her any more trustworthy. If it weren't him, it would be someone else.
One who commits murder only takes someone's life. The victim's problems are over. An adulterer, takes peoples' past, present, and future plans and dreams, leaving others with the tough work of cleaning up their mess. Murderers rarely reoffend but adulterers almost always do. I could make a pretty strong argument that adulterers deserve a headshot more than a murderer.