Hold up a second... You said that guns were a deterrent. If that was the case, then there should be no crime at all because we have the highest guns-per-capita in the world. But we do have crime. So that means guns aren't a deterrent. Of the 153 mass shootings (defined as a shooting where more than 4 people are killed) from 2005-2014, only 15 were in "gun free zones". Besides, with the highest guns-per-capita in the world, we shouldn't have any crime because according to you, guns are a deterrent.