Mainly idiots with more money than sense that buy them and then let them off early when it is still daylight and late (after midnight quite often).
How on earth do people get pleasure in fireworks that sound like bombs going off? Yes they do sound like bombs (I have heard a bomb going off) and they rattle windows.
They cause upset and even terror. They cause injuries and even deaths.
It's not just cats and dogs. It's wild animals, sheep, cows, horses, pigs, donkeys etc. It is old people, people with dementia, people with ptsd, babies, some children.
Awful things should have been banned years ago