I take your point, but it still remains that the vast majority of Wal Marts across the United States do not sell firearms at all, and less than half of Dicks stores sell guns any more. Unfortunately in many places it would be faster, easier and cheaper to buy a gun illegally.
I am an ex pat who grew up in the midlands and moved to downstate Illinois in the late 80's. Live in a city of about 100,000 people. With it being relatively rural, most everyone I have known the entire time has owned firearms. No personal experience with gun crime, and the only person I know is my brother in law who was carjacked at gunpoint in St. Louis. So personal experience and perspective is fascinating.
Aside from the fringes on both sides, most Americans want legal firearms with sensible restriction. This sentiment is really shown in how the entire debate is approached. Gun related accidents and suicides far out number murders and shootings, yet the debate and outrage really only flares like this when there is a mass incident like this.
With suicides, the focus is on mental health and how the person could have been helped and the gun is not even talked about.
With accidents, it is just generally accepted that accidents happen...that is unless it is a child. When it is a child, the discussion goes to responsible storage, keeping the gun out of the hands of a kid, and should the gun owner be prosecuted...not all that different than any other negligent act.
It really is a different cultural mindset than anywhere else, and unless one actually lives in it, they are going to struggle to understand it at all.