There are so many dangerous things around. Preventing all of them would mean to be still in a bed all day. As a teenager me and my friends were not using fireworks, we were building them from scratch creating the explosives ourselves. We have all fingers, we learned chemistry more with that than school and we were probably more safe and happy then some kids today they spend the entire day home on a mobile phone or a computer. They don't have broken finger, they have broken brains.