If only because the TV won't shutup about it, I want to throw this out there. This is not to minimize what happened recently in anyway, but most are following knee-jerk reactions and speaking from emotion without any idea about some facts.
In 2005 there were 10,100 homicides caused by firearms, the majority of which being handguns. Not assault rifles. Murders by any firearm type are either the lowest they've been since the early 1980's, or the lowest they've been in general.
A study published in 2011 in the Archives of Internal Medicine showed that sepsis and pneumonia caused by hospital acquired infections killed 48,000 patients in 2006. A second study showed that bloodstream infections caused an additional 100,000.
In 2004 there were 42,836 men, women, and children killed in traffic fatalities. Another 43,443 in 2005.
So, when will we call for a ban on doctors and nurses? How about vehicles? It's clear both kill many more men, women, and children every year yet no one says a word.
This was sourced from both Wikipedia and medical journals. Please feel free to take 5 minutes and verify my information if you doubt the numbers.
Remember - Gun laws (or laws of any type) only apply to those who are law abiding. Criminals don't give a damn, and never will.