The mass shooting in Buffalo on Saturday afternoon marks another horrendous milestone in the confluence of white supremacist extremism and America's disastrously loose gun laws.It meant that a teenager filled with deep reservoirs of racial hatred and anti-semitism could pull up at a supermarket armed with an assault weapon and open fire on Saturday afternoon shoppers. He was wearing military gear, including a bullet proof vest and a combat helmet.Payton Gendron was just 18 years old. He had published online a 180-page manifesto containing far right conspiracy theories, echoing the same language as the 2019 New Zealand extremist who massacred...