The outdoor jail that was Mr. Arpaio’s marquee undertaking was a travesty. Ostensibly established to save money and deter criminals, who presumably would want to avoid sweltering in desert heat, it failed on both counts. In fact, closing the encampment will save taxpayers some $4.5 million annually. And in a recent study, the inmates there said they preferred the facility, the heat notwithstanding, to the cramped cells in conventional jails. In announcing that the encampment would be closed, after 24 years, Mr. Arpaio’s successor, Paul Penzone, a Democrat, said, “Starting today, the circus ends, and the tents come down.” Mr....