I used to think that if a man came into my house to attack my wife, I would certainly stand up to him. But then I came to realize that the man who enters my house and assaults my wife every day is me, through my anger, my harsh words, my complaints, and my indifference. As a Christian, I came to realize that the man I needed to kill in order to protect my wife is myself as a sinner.
Richard Philips, The Masculine Mandate, 87
Christianity Matters 
You might want to do a follow up on this post. It does not come across the way I think you mean. In every marriage there are some disagreements, but not everyday, and not bad enough that someone needs to be killed.
Sent from Windows Mail
Killing is a metaphor for ridding sin from our lives, so the idea is that you would always be working to kill your sin nature because it’s what leads to disagreements.
An example would be the sin of selfishness. If we want to love our wives as we should, we should work daily, through the power of the Holy Spirit, to rid that sin from our lives. As we become less and less selfish, we will more easily give ourselves to our wives, sacrificing for their well-being (physical, emotional, and spiritual).
Does that make more sense?