Oh to be young again, you sound real grumpy! If you can't stand the noise then live out of the city, it is one of the downsides of living here, but so much else going for it than being stuck in the middle of nowhere!
Can't they be forgiven for being naughty bored kids, I grew up in the countryside and had the same ideas about letting off fireworks etc, does not change the way kids think just cos they live in the city!
It's not that I have sympathy with them. I think that it sounds awful and I wish they would stop. Someone needs to do something, or, as you say, somebody might get hurt. But I do not wish them the sort of injuries that would result from a firework going off in their pocket. That's all.