Wister Au hit the streets on Sunday – along with up to a million others – just as he had during the 2003 protest against national security legislation and the 2014 Occupy movement for democracy.This time, he was also marching for his 14-month-old son Marcus.In all, 1.03 million people took part in Sunday’s march, according to the organiser Civil Human Rights Front, double the turnout of the 2003 protest. Police put the figure at 240,000.They came, young and old and from all walks of lives, to…