Those who think that “violence never solves anything” have never studied history. For good or ill, violence has transformed a great many historical trends. Constantine’s vision and victory at the Battle of Milvian Bridge not only transformed Christianity from a minority to a world religion, but also transformed the nature of Christianity by creating the “Imperial Church,” and its 1500 years of infestation with numerous forms of priestcraft.
Here is the famous commemoration of that event by Guilio Romano (1520) in the Vatican’s Hall of Constantine.
Here is the Milvian Bridge today, with the lower Roman stones still intact.