Why Does the World Consider Offending Someone to Be the Greatest Sin?

Questions about a winsome response to someone who defends abortion by arguing that an unwanted pregnancy could lead to the mother’s suicide and why the world considers offending someone to be the greatest sin. 

• What’s a winsome response to someone who defends abortion by arguing an unwanted pregnancy may cause great suffering and/or lead to suicide?
• Why do you think offending someone is seen as the greatest sin in the world’s eyes?