Had one of these uncles, he also featured a single good eye, the other damaged in a previous fireworks mishap. Didn't stop him though, and the bad eye could see clear underwater he'd say.
I didn't have a chance to be this year, but I'm usually that uncle. I've also been known to repackage individual fireworks into much larger fireworks. I used to make thermite but I'm too nervous for that now.
I do take safety precautions and the kids don't get to play with the shit that will blow you up. If an adult wants to blow off their fingers that's their problem.
My mother was just telling me about "Motorcycle Pete", an old man who lived in our neighborhood through her childhood and early adulthood who was known for making homemade fireworks for the kids in town.