The charge: The Tucson massacre is a consequence of the "climate of hate" created by Sarah Palin, the Tea Party, Glenn Beck, ObamaCare opponents and sundry other liberal betes noires. The verdict: Rarely in American political discourse has there been a charge so reckless, so scurrilous and so unsupported by evidence. As killers go, Jared Loughner is not reticent. Yet among all his writings, postings, videos and other ravings — and in all the testimony from all the people who knew him — there is not a single reference to any of these supposed accessories to murder. Not only is...