You can think about what are the things that cause violence and you can make a whole list.
Attachment also causes violence. Extreme passion without wisdom can cause violence.
You hear all these stories in the newspaper. Two people who initially love each other and they later become so violent to each other, that they kill each other. Haven’t you heard of these things?
All over the world, you hear of people who have fallen in love and then later stabbed each other. It’s unbelievable. So wisdom is essential. Just love or passion is not enough.
Love without wisdom is misery. If you don’t have wisdom and are not balanced, then that can cause violence. But if you are totally dedicated to something, then that is different. Then you don’t lose your wisdom.
Nowadays when you read the newspaper or switch on the television, every day, you get some such story, and there may be many more such incidences that go unreported.