Reid Hoffman,venture capitalist and co-founder of LinkedIn, made a despicable joke Friday about Donald Trump that history will judge harshly. In Sun Valley, Idaho, at the Allen & Co. conference – an invitation-only gathering called the “summer camp for billionaires” – Hoffman and estranged friend and Trump supporter Peter Thiel got into a disagreement about Trump that spurred Hoffman to make a dark comment. Hoffman made his comment barely 24 hours before a Trump rally in Pennsylvania ended abruptly after what appeared to be a hail of gunshots and Trump being removed by Secret Service agents with what appeared to...