The damage to national security from Hillary Clinton’s choice to use an unsecured private server to handle all her State Department business is substantial, and could well be catastrophic. Friday night’s release of 800 emails included 88 more with classified data, bringing the total to 1818, including 22 so top secret that no portion of them can be released to the public. It is all but certain that America’s enemies, ever alert to hacking opportunities, have read everything that was on the server, even the yoga positions and wedding plans. But also the national security details, including names of secret...