He says that rulers are ordained by God as His ministers. This is powerful language. It invokes the authority of God on behalf of the State. If Paul is correct, then anarcho-capitalism is incorrect. There is no way around this.
Christian anarchism is an oxymoron.
The threat of crime forces men to allocate scarce economic resources to the defense againsy criminals. The State is the promary institutional means of crime prevention. The State imposes negative sanctions on convicted criminals. The goal is to uphold justice by means of fear. And those which remain shall hear, and fear, and shall henceforth commit no more any such evil among you.