Support for the Black Lives Matter movement has increased among young white adults, according to a poll that suggests a majority of white, black, Asian and Hispanic young adults now support the movement calling for accountability for police in the deaths of African-Americans. Fifty-one percent of white adults between the ages of 18 and 30 say in a GenForward poll they now strongly or somewhat support Black Lives Matter, a 10-point increase since June, while 42 percent said they do not support the movement. But most young whites also think the movement’s rhetoric encourages violence against the police, while the...