I think you've made an error here. Florence's arrest was reasonable as far as it went. He had pled guilty 2 years earlier to obstruction of justice and use of a deadly weapon, and been fined, the fine being payable in installments. One of his payments was late, and an arrest warrant was issued. He made the payment soon afterwards, but the warrant was never cancelled. So the arresting officer checked his identity, found priors involving deadly weapons and an outstanding arrest warrant, and enforced the warrant.

My issues with this are that a) someone gets thrown into general population while an administrative issue is being resolved, and b) the nature of his apparent offense (unpaid fine, rather than an act of commission).