AURORA. NEWTOWN. SAN BERNARDINO. AND NOW KALAMAZOO.Mass shootings have become sickeningly routine in the US, each resulting in outpourings of grief and calls for more robust gun control—countered by arguments that the problem is everything but the guns. However, the data is irrefutable: The US is home to more firearms than adults; more people own guns here than in any other nation; and the US is also host to more gun deaths per capita than any other advanced country.