In a short order issued Monday, the U.S. Supreme Court ruled 5-4 to overturn an injunction that had prevented Customs and Border Protection from removing concertina wire set by Texas Gov. Greg Abbott as part of his long-running effort to build a parallel border enforcement infrastructure. That’s good news. The order comes in response to an emergency motion, so it doesn’t feature the lengthy legal reasoning that is typical of full decisions. We’re left to speculate as to the majority’s reasoning, though it’s not difficult to imagine. The court more than a century ago clarified that regulating i…