This is "National Guilt Day," in Occupied America (liberal-infested campuses) where pious Kumbayists and aging draft-dodger academics cry, hug each other, shake their feathers at the local ROTC, and gravely intone that the US "is the only nation that ever used nuclear weapons."
The rank and file MumiaCong may be unaware of it, but the ringleaders certainly know that this misleading half-truth was originally attributed to Joseph Stalin, as though he would have refrained from nuking Berlin if it had been within his power.
The one thing the students never seem to bring up is that it was a Democrat that used this weapon of mass destruction. I doubt that most college students could tell you what party Harry Truman belonged to.