Back during the fight for Constitutional Carry in Arizona, I had an anti-gun newspaper columnist condemning the idea that anyone would carry guns in the first place.
I offered a public challenge -- which he refused to acknowledge, though I repeated it several times -- that we start in south central Phoenix at midnight on a Saturday in June, and walk three miles to benches on opposite sides of the state capitol building, where we would sit, alone, until sunrise. Each of us would walk, alone, on routes half a mile apart.
I would, of course, have my pistol, while he, of course, would not.
I chose routes half a mile apart so that I would be able to hear the sirens as the cops and EMS came to try to save his life after the near-certain attack.
You might make a similar suggestion to anyone who says that the university campuses are safer when only the cops and the rapists have weapons.