The magician tricks the audience by directing their attention over there, while over here he is pulling something from his sleeve.
Guns are simply a distraction. A place to focus attention when the real problems are elsewhere. On one hand, you have the question of why do people want to kill people. OTOH there is the vast array of killing methods.
When every person is blessed by these principles:
"We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness."
- and when everyone has a fair chance at a good life including medical care, economic opportunity and freedom from oppression, there will be less incentive to kill. Millions of Americans, not to mention those in other countries, have no hope of a good life. They look around at others who have it all, but there is not a pittance for them nor anyone to care for their physical or mental health.
For those who want to kill, guns are not the only resource. Knives might be the obvious alternative, or clubs. But my friend who lived in a rough part of the city used to carry a squeeze bottle of acid as a defense. These are still small potatoes when any interested party can make powerful explosives and chemical/biological poisons that can be widely distributed in air or water, or simply added to Halloween candy.
Are guns such a threat, or are we being manipulated to distract us from the real threats?