How responsible is immigration policy for Mollie Tibbetts's murder?
The chief culprit, obviously, is the murderer himself, Mexican illegal alien Cristhian Rivera (if that's even his real name). But immigration control is one of the elemental responsibilities of the national government, and it failed in this case. As Senator Tom Cotton put it: "Mollie would be alive if our government had taken immigration enforcement seriously years ago."
But there are different levels of culpability.