A UK white supremacist could be extradited to the US for posting a series of vile videos that “encouraged and in part motivated” Buffalo mass shooter Peyton Gendron, a court was told. Daniel Harris, 19, was found guilty Tuesday of encouraging terrorism with the videos that called for an armed insurrection and glorified racist mass murderers, Derbyshire police said. Prosecutor Joe Allman told the court that the videos “encouraged and in part motivated” fellow teen Gendron, then 18, who killed 10 black Tops shoppers in May, The Times of London said. Gendron — who pleaded guilty to the mass shooting...