What are my chances of being killed in a shooting spree?

This can be a touchy subject (child murder), suspicious reporting from the MSM (no shit Sherlock!) but it should not be considered worthy of pushing for Gun Control.

To get a perspective of the stats:

Bureau of Justice Homicide Trends in the United States, 1980-2008

In 2008, of all homicide incidents—
3.7% involved two victims
0.5% involved three victims
0.2% involved four victims
0.1% involved five or more victims.

[link to www.google.co.uk (secure)]

So the good news is that multiple civilian deaths per population are rare to say the least.

To be killed in school by a crazed gunman (or CIA manchurian candidate) is still less than being struck by lightening

If they want to bump the stats up worthy of Gun confiscation then they'll need to arrange daily school shootings.