WASHINGTON – The man who opened fire at the outlet mall in Allen, Texas, brought eight guns – one for each innocent life he ended, as it turned out. Existing federal laws would not have stopped Mauricio Garcia from buying those guns. He’d done nothing to draw attention from law enforcement before Saturday’s rampage. Hateful, neo-Nazi postings don’t trigger a report to the national database used to screen out dangerous gun buyers. Nor did whatever prompted the Army to kick Garcia out before he finished basic training. “All the weapons were legally obtained by the shooter,” Hank Sibley, the Texas...