I agree. However a person with a .12 gauge pump action shotgun that can carry 9 rounds (like mine) can do a huge amount of damage at close range - killing or greating harming several people with one shot. And that can be fired just as fast as you can pump it (a second or less between rounds). And a standard 6 shot revolver can be reloaded within less than a second with a speed loader - and someone could carry a large number of those on a belt. Same with a magazine for a pistol or hunting rifle. Even a standard bolt action rifle can be "cocked" and fired just as fast as you can do the bolt thingie. So even banning the use all semi-automatic firearms won't stop gun violence - at least not of this type. As someone has said, there are over 300 million legally registered firearms in this country - not counting those that are illegal and unregistered. That means that of those 300 million plus firearms out there, only a tiny fraction of those are used in a crime - and even less in a case like this of a mass shooter. To me that makes gun owners overall a safe and sane bunch. In comparision there are approx. 250million registered vehicles in the USA and close to 40,000 vehicular deaths/year - each and every year. I don't see anyone wanting to ban autos because using them may cause accidents or deaths for many people.
And for those who say there are no restrictions on firearms in this country - check out the different states policies. I'm in Calif, which has the toughest gun laws in the nation. Buying a gun is difficult here, and carrying a loaded, concealed gun legally is next to impossible because it's impossible to get permits (issued by the county sheriff around these here parts) - yet we have one of the highest gun-crime and death/injury in the nation. Many done with non-semi automatic firearms.