Human evil is of a special kind because human beings have knowledge and will. They are not driven by instincts alone. Their actions are the result of free choice. All of God's attributes are perfect. Omnipotent means he can do everything he wills to do.
Violence is the use of force.
Though there are many Bible stories in which violence seems to be justified in the Bible, modern Jews would interpret the Bible as describing the times rather than justifying the same kind of violence today. Today there are many Christians who believe war can no longer be justified because of its ravages, especially on civilians. My own reflection on the subject would underscore that evil remains a mystery. It is very difficult to understand and fathom. We know it exists, there is daily evidence of it.