So mourners expected a fine speech with words of consolation and condolence that at least they were not alone. It may have been his best. Delivered without a teleprompter and interrupted only by occasional deep sobs from the audience, Obama’s words reached a level of empathy that reminded some of Ronald Reagan in 1986 after the Challenger disaster and Bill Clinton after the Oklahoma City bombing in 1995. But above all, Newtown may thank Mr Obama for making this the moment when America addresses its addiction to weapons.