The part about don't touch it, leave it alone, etc. is right out of the NRA Eddie Eagle gun safety for kids course. At least it was back when I used it for my own kids.
I don't have any of the new materials, but the Eddie Eagle video we use says that exact thing.
I also emphasize that they shouldn't argue with some other kid who wants to touch it or play with it. Get away immediately and find an adult.
(That was an interesting issue that came up when I was teaching it to some other children. At least one said that he needed to make sure no one else touches it. I said that his job was to tell them not to play with it and that they should all get away. And then you get away quickly. If they don't listen, you've done your job. Get an adult and let them deal with it.)
Children should have a fear of guns, but a healthy fear. Just like they should have a fear of cars, tools, etc... Things that can kill you are scary, but you need to learn to deal with them properly.