Its very different, I wouldn't let kids play with chemicals or other peoples prescription medication even if I was watching, nor would I give them as gifts. If anyone gave a 5 year old a bottle of chemicals as a present then let them play with it unattended they'd be getting charged with a criminal offence.
How its acceptable to market lethal weapons to children/purchase them as gifts for a 5 year old I'll never know.
At some point (early) my Son is going to be introduce to firearms, probably rifles. He'll be closely supervised. They'll be demystified and good skills and drills will be ingrained from an early age. Just because a child might have their own of something doesn't mean it's theirs to use, keep under their bed without oversight. We're saving for out little boy and when he's old enough he'll get to spend some of his own money, with our permission, up to a point. It's about taking the responsibility for him.
My lad toddled into the garage after me last weekend as I was getting some stuff out of the fridge. He found a (poorly placed) tub of polly filla and managed to get the top of it off and as is his want at the moment, lick the (outside) of the lid. All in the space of about 10 seconds and I was about 3 feet from him, cue dropped food all over the place a shout and my snatching him up off the floor. Boy, that's very very naughty don't ever do that again! Mummy, here's little boy. Quietly, "Daddy was very naughty and didn't do his job properly." I've now moved all the stuff off the floor that poses a significant risk to him and the garage is now off limits (along with the kitchen which is already).
I'm with Americop, it's poor parenting and the ramifications here were terrible.