A healthy democratic community makes space for a broad range of perspectives, but what happens to society when people who feel unheard and disenfranchised are drawn further towards the fringes? In this series from SBS News we look at the enduring issues of extremism and terrorism. Why do people join extremist movements? What are the risks and politics of the far right? And how are governments and international agencies tackling the threat of terrorism after high profile incidents like the US Capitol insurrection and the Christchurch massacre?