The long and the short of it is that we live in a society of different people who enjoy different things. Nearly everything is a trade off of some sort. Some people value the enjoyment they get from fireworks more than others. Some hate it. That is true of litterally everything. I strongly dislike the keeping of pets on anything smaller than a farm. But I don’t tell people they shouldn’t have pets. Being part of a society means living with a mix of things you like and don’t. And the society determines what is so commonly disliked that it should be not allowed by the law. Now many will say the fireworks are illegal in a lot of places. Yes so is speeding. Our system has three parts, the laws, the enforcement, and the penalties. Enforcement of fireworks laws are often pretty lax, same with speeding. And the penalties are almost always purely monetary. So society has said it doesn’t really care that much about fireworks. And the large number of people who use them and who show up to fireworks shows backs that up.