Consider that POSUS is pardoning Arpiao for doing what he has done--ignoring orders from a federal court. He's just being consistent.

"Consistency is the hallmark of the unimaginative."
― Oscar Wilde

"A foolish consistency is the hobgoblin of little minds."
― Ralph Waldo Emerson

I knew I'd heard a good quote about 'consistency'. I was surprised when googling it Here just how many there were. (It was the Emerson one I recalled)