Lists of best and worst presidents are usually popularity contests based on the politics of the ones doing the ranking. The new book Presidents' Body Counts: The Twelve Worst and Four Best American Presidents Based on How Many Lived or Died uses a humanitarian standard, not a political one. Nixon, Reagan, and Jackson all played a direct role in genocide against Cambodians, Central Americans, and Native tribes. Polk, Fillmore, Clinton, and Ford all ignored genocides against California Indians, Rwandans, and East Timor. Truman, McKinley, GW Bush, and Andrew Johnson all caused huge numbers of deaths by incredible incompetence in the Cold War, the Filipino War, the Iraq and Afghan Wars, and Reconstruction.