Harry had gone to Voldemort, as he was always meant to do. Apparently. But he never returned. Voldemort threw his body at their feet and crowed. Neville took care of the last Horcrux, and it was Professor McGonagall's curse that finally killed the Dark Lord. They mourned Harry, and celebrated the end of a tyranny. It wouldn't be easy to repair society, but it would be worth it.