The root cause of most murder is nothing more than anger. No wonder Jesus came down so hard on it. Anger is dangerous. Obviously, murder is not the only outcome of anger. Other harm can be done as well.
Angry words can wound with insult.
It has happened to most of us. Let me tell you about my grandmother, a shy and sensitive lady who lived to be just three weeks shy of her 100th birthday. When she was a young girl, about ten years old or so, somebody told her that she had a terrible singing voice. Now, most of us, I guess, would not let that remark bother us particularly, but it DID bother grandmother. Ten years old is a tender age.