@SoldTheMovieRights You realise there are 'silent' fireworks that actually produce small popping noises, and garden fireworks that produce a somewhat higher volume, then loud fireworks which are, loud, and then display grade fireworks which are car-alarm triggering, house shaking, window rattling, feel-it-in-your-boots loud... right?
Those Cat F2 and F3 (public use) fireworks can be easily over 100decibels, the professional Cat F4 which legally only licenced professionals should use but everyone knows someone, are into the 150db+ range.
Not all fireworks are exactly the same volume.
One night of half an hour of mild popping sounds is fine, very few people or animals would take issue with that.
3 solid weeks of random, no warning, sometimes rattling on for hours, starting from as early as 2pm somedays, of the all varieties of volume - thats another matter entirely. I started showing symptoms of stress after that never mind the dogs (Who are in my case, not actually scared of fireworks currently and we work hard to do what we can to ensure they stay that way).
In humans, when they are subjected to unpredictable stressors, stressors they cannot escape from or find a way to stop... we often see the development of PTSD.
We see the same behaviour processes/patterns in animals - we're not not ethically allowed to test them and call it PTSD... but from an animal behaviourist, it absolutely is.
Behaviour modification to 'undo' PTSD or extreme sound phobias, in animals, when you the handler are NOT in control of the stimulus... is incredibly difficult, sometimes it's impossible. It's not easy if you are in full control of exposure to the stimulus and can explain the process to the subject.
So yeah, thats the big deal. It can be incredibly traumatic for some people and for many animals, and it is very very hard to deal with due to the unpredictable timing and volume and duration of exposure.