Just to add to the anecdotes:
I'm in my late 40s. I grew up on an island in Washington state. Truly commercial-grade fireworks (the kind that professionals would launch for an audience of thousands) were banned by that time, but plenty of fireworks that would be categorized as "commercial-grade" today were sold publicly by multiple vendors every year.
I love fireworks now, but my first memory of them was terrifying. I would have been about 3 to 5. My parents drove our VW bus to a nearby beach to watch the local display. It was total madness. Teenagers threw explosive fireworks onto and underneath our car.
Even a lot of the smaller home-use fireworks back then had hilariously unsafe behaviour. I remember in particular one called something like "Saturn Missile Battery". It was a box that launched a 10x10 grid of 100 whistling, finless plastic rockets (each about 4-5cm x 5-6mm), with each rocket exploding when their propellant ran out. Because they had no stabilization, they would fly in all directions, change direction in flight, etc. When my dad set it off, one of them literally flew right over our heads into the house and exploded in the basement.
My experience is that outside of Seattle, enforcement of fireworks restrictions is pretty lax. For example, if one watches the professional display in Tacoma, one will also see most of Dash Point / Browns Point continuously lit up by fireworks that are unambiguously well outside the legal restrictions.
I agree that a lot of people are reckless, and it's just a matter of time before it causes a high-profile disaster somewhere in the state. But I also agree with the parent comment that it's such an ingrained part of American culture that it would be very hard to change - at least until there's a local disaster that gives people a visceral feeling for the danger.