The real Wyatt Earp demanded the cowboys who came to Dodge and liked to shoot up the town for fun surrender their guns, don’t know about O’brien’s beliefs. I wasn’t like the cowboys off of months on the cattle trails acted responsibly with their firearms, just the opposite.
I used to work Dodge City when I lived in Western Kansas.
The city had a law banning guns North of the Arkansas River. In actual fact it only applied to the Cowboys. The reason was the same as now.
They wanted the people in power (the saloon owners etc.) to be able to rob the Cowboys with impunity.