When the Bush Administration failed to find the weapons of mass destruction that Saddam Hussein was thought to have, opponents used the intelligence failure to discredit the war in Iraq and call George W. Bush a liar. Will there be any even remotely similar accounting after the Obama Administration’s intelligence failure in Syria, where Bashar Assad has used chemical weapons we were told he didn’t have?

On Tuesday at least 85 civilians, including children, were killed by a gas attack in the rebel-held town of Khan Sheikhoun....