I voted that yes they are dangerous, but that is still to broad of a brush to paint everyone with. Some kids will be fine and others won't. Sometimes we are surprised by which ones are influenced into bad choices from family, friends, or just their everyday surroundings. I believe that there are just too many good options for quick access that will help keep everyone safer in you home than leaving guns laying around.
That being said, I come from a home where my dad always had loaded and chambered guns throughout the home and I was just fine. Most of the time when hanging around with friends I was at thier homes in the subdivision where most of my close friends lived. We lived just on the outskirts and my friends never really hung out at my house because it was harder for us all to get together there.