View Comments Abraham Lincoln, quoting Jesus, said, “A house divided against itself cannot stand.” They weren’t playing. More than half of us (54%) now say our fellow Americans pose the biggest threat to the country. Described as a “singularly virulent and dangerous phenomenon” and “our greatest national security vulnerability,” toxic polarization – the way we demonize one another across differences – is a grave threat to all Americans, our families, our communities and our country. Sadly, today “they” are our “enemies,” a “serious threat” and “downright evil.” One in five Americans say many members of the other side “lack the traits to be considered fully human.” And 15% of Republicans and 20% of Democrats say the country would be better off if large numbers of opposing partisans “just died.”