Somebody please save me from the guns

The United States drew horrified/disgusted/bewildered gasps from the rest of the world in February when yet another mass shooting unfolded at a high school.

What is it about the guns and those crazy Americans? Why is it seemingly impossible to prevent crimes like this?

I've never seen a gun in China, except on TV and those carried by soldiers. By contrast, in the United States they're everywhere, both seen and unseen, and easily available to the general public. Guns are found in around 35 percent of households.