I guess how common it is to see guns openly carried or "around" depends on where in the US you are. Here in the KC area it would be uincommon, but not unheard of, to see a gun in a rack in a pickup, or someone openly carrying a firearm. I can assure you that there are ALOT of guns in this town, though, as being outdoors on July 4th or New Year's Eve means taking your life in your hands... even the police take cover at midnight on New Year's..... Go out to the rural areas, though, and you'll see more guns.
At our very remote cabin in Montana, we both ALWAYS carried a gun anytime we left the front porch. People out recreating in the mountains, I believe without exception, carried guns. If someone came up to the cabin it was customary for them to stand out in the "driveway", at least 50 feet from the cabin, and holler "Hello in the house" so as not to startle the residents into coming out with gun drawn.
At my grandpa's farm in rural MO 50 years ago, he always had several guns hanging on the wall (which most any of us kids could easily reach). We were all told to NEVER touch the guns and so none of us did. When my daughter was little I kept a shotgun in the house (loaded), and instructed her from the time she was able to even crawl that she was NEVER to touch it.... just as I told her to NEVER touch anything under the sink, or any glass objects, or anything else I didn't want destroyed.... she had certain toys that she could play with all she wanted but MY stuff was off limits.... never had any incident with any of it. Nowadays people lock up everything they own from their kids, I guess because they are too lazy to TEACH their kids to keep their mitts off certain things. Just like I knew when I was a kid, my daughter knew when she was a kid that she'd get her butt blistered if she got into something she wasn't supposed to. I have made sure to teach my grandson about guns too, a la the "Eddie Eagle" program, and I've also taught him basic gun safety and let him handle my unloaded pistol (after making HIM check to make sure it was unloaded). If people are not willing to TEACH their kids anything, it's no wonder they get into trouble. Just my two cents worth.