Or for that matter, looking at anything that’s intensely and variously coloured, like Christmas illuminations , fibre optic lamps, vast prairies carpeted with flowers, Dutch bulb fields, rainbows etc.
??
Because most of nature is monochrome or shades of green/brown??
Gp
Why do people like to climb up on the roof to watch thunderstorms? Probably the same reason.
Bubblegum for the eyes? 
No cite for this, but my guess is that any spectacular or unusual visual display causes an instinctive “goggle” response to kick in because it’s in our nature to investigate the unknown.
Most predatory animals do this, and all animals that exhibit intelligence do it, but humans are an extreme case. Put a strange-looking or strange-smelling object in a bear’s or cat’s territory and they’ll investigate it to destruction. Give a human a scene they don’t see every day, or a spectacular live performance and we can’t resist looking at it.
It’s the same reason for rubber-knecking at car accidents, and as an instinct has probably saved our bacon countless times since we climbed out of the trees.
Speaking as a fireworks GLUTTON I must say that I like to watch them because even though I’m an adult with adult knowledge, they strike me as something magical. Fireworks are sparkly and colorful and they flicker and fall like stars. They light up your face and disappear.
I love them so much that almost every time I see fireworks, I start crying because I’m overcome with awe.
My husband secretly arranged for an archway of white ground fireworks at our wedding for when we exited the church. It was, without question, my favorite moment of perhaps my life.
jar
I wiggle my tentacles in glee whenever your Fourth of July comes around. It’s probably my K’tangken’s Node in my brain, which regulates the optics of my eyestalks, that causes my emotional glee whenever I see aerial pyrotechnics.
Oh, why do humans enjoy fireworks! Sorry, sorry.
why must there be a scientific explanation? Perhaps we just do because of all the pretty colors.
Is it the novelty or the actual fireworks we like? The only way to solve this is to do an experiment:
Set fireworks off all the time for at least a year. Then, announce that on July 4 the fireworks will stop for 30 minutes in the local park, providing an interlude of plain, still, colorless, noiseless sky. And see how many people turn up!
Simple.
Stimulus.
mmm…colors
Why do we like skiing, or watching tv, or playing in Autumn leaves? Why do we like anything?
I personally find no enjoyment to fireworks - they do nothing for me.
Why should there not be an explanation?
HOW could there not be an explanation?
(your comment “Perhaps we just do because of all the pretty colors” IS an explanation).
So I can see one fall on the crowd.
Also, we only get to see them once a year in my city & its always for a celebration/pageant so it’s fun to see those.
Where I live, I can hear fireworks about once every 2 weeks or so on average. When I first moved here I would go out to see them (if I could). Now I don’t bother except for the really big shows.
So, I think it’s the novelty.
ooooh!
ahhhh!
ooooh!
ahhhh!