We have a real world test to draw upon. This is not theory, not a projection, not conjecture. Just actual FACTS. From Rob Blackstock on LewRockwell.com (a great site btw).

Scotland banned almost all handgun ownership in 1997 in a panicked, emotional overreaction to the March 13, 1996 school shooting in Dunblane, Scotland. What did this get the Scots?

A United Nations report has labeled Scotland the most violent country in the developed world, with people three times more likely to be assaulted than in America. England and Wales recorded the second highest number of violent assaults while Northern Ireland recorded the fewest.

3 per cent of Scots had been victims of assault compared with 1.2 per cent in America and just 0.1 per cent in Japan, 0.2 per cent in Italy and 0.8 per cent in Austria. In England and Wales the figure was 2.8 per cent.

I feel much safer as an armed citizen among other armed citizens than I would depending on the police state to protect me. Now there is a real world example to point to.