Just to chime in: this type of horrible event doesn't happen with any type of regularity. With all the guns we own in the U.S., this type of act is not a regular occurance.
Unfortunately, the world is a violent place. We're lucky that we don't have more incidents like the OKC Bombing, or smaller, targetted bombings that other countries have. When's the last time the U.S. had riots like they had in France a few years ago?
Now, as for the weapons used in the majority of murders, they're handguns, not 'Assault Rifles'.
http://www.fbi.gov/about-us/cjis/ucr/crime-in-the-u.s/2010/crime-in-the-u.s.-2010/tables/10tbl20.xlsThe link to the statistics on violent crimes (non-murders) shows that guns aren't the #1 weapon:
http://www.fbi.gov/about-us/cjis/ucr/crime-in-the-u.s/2010/crime-in-the-u.s.-2010/tables/10tbl19.xlsThis link shows that gun deaths are actually surprised by drug related deaths:
http://www.cdc.gov/nchs/data/nvsr/nvsr59/nvsr59_10_tables.pdfAs for child deaths, it's not as common as you think either. It's just simply tragic and heartbreaking:
http://www.cdc.gov/Injury/wisqars/pdf/Leading_Causes_injury_Deaths_Age_GRoup_Highlighting_Unintentional_Injury%20Deaths_US_2009-a.pdfThe problem is that all media sensationalizes these specific, horrific events, replaying them hour after hour as if they are commonplace in our daily world. They then bring on people to talk about gun control, and reinstating an 'Assault Weapons Ban' (AWB), but those speakers don't realize that the AWB didn't ban anything of significance.
Then you have people who believe that you can turn a semi-auto AR or AK into a full-auto by filing down the firing pin. Or newsfolks and politicians who think it's possible to buy grenades or rocket launchers at a gun store. Or that a .50 BMG will take down a commercial airliner at 1.5 miles. This is what is spread on the mainstream media news channels.
Basically, a whole lot of misinformation, and not a lot of attention to the facts, the laws, or the statistics.
When my wife first saw one of my AR15's, she thought it was illegal. I explained that it wasn't. She asked about the AWB. I explained what was 'banned' during the AWB period. Her response, never being a gun owner, or into shooting: "That's pretty stupid. What would it have stopped?"
Anyways, I'm always going to be in favor of being able to defend my family and myself with the most efficient means necessary. I don't think it's right to take that option away from people because of an emotional reaction to a tragic event.