Killing someone who needs kiling is an option, not a mandate. Each person must decide in each case what is apropriate behavior for them.
It may be that his first wife should have killed him and clara. That was her decision to make. She chose not to. That is none of our business. It was a private matter and a private decision.
So9
I hate to be the one to break this to you: This is not 1845, Texas is no longer a Territory, and you are not Bat Masterson. I wish it was, I wish it was, I wish you were.