PHILADELPHIA — The long local nightmare is over. James Harden has arrived. Ben Simmons has left. And if you’ve paid any attention to social media and the currents and eddies of public discussion about the 76ers-Nets trade that shook the NBA last week, you know that, once more, a Philadelphia-related story of national interest has followed a familiar pattern. It has devolved, thanks to Simmons’ claims that he suffered from mental-health issues, into a cliched and tiresome debate over whether fans here create a particularly toxic environment for athletes and coaches. The debate is tiresome for a…
