By . The last weeks of the fall semester were uneasy ones on many campuses as students angrily protested the police killings of Michael Brown, Eric Garner, and Tamir Rice. We can pretend that we didn’t really know what happened in these cases: parse the Ferguson, Mo., grand-jury testimony, ignore the video of Staten Island police taking Garner down in a choke hold, or speculate on what happened in the two seconds that elapsed between the arrival of police at a Cleveland playground and the shooting of 12-year-old Rice. More...