Light your BBQ with the lid down, 'Whump', a mini explosion. Light a pile of gunpowder laying on the street, 'Fssst."
"Oh we all have dangerous things in the house!" If we use them in the wrong way, then yes. I would like to have dome raw fertilizer. Mix it with sugar and make a rocket, would be fun. But the average person trying to buy some without being a farmer, you might get a call from the authorities. You whole point was that some things are seen as acceptable in society, some things are not. Hard drugs are not, they can be (in some form) used medically (think heroin) if used in a medical context, but society has not found it to be acceptable as something I just want to take for fun. Get over it.
The explosive part? It is in large part due to the exponent. My sinature (if that is the right term) explains why I may know a little about it.