He never stated he'd added them to start with so I'd say he tried to.
He shouldnt have to explicitly state that he's added something to the shot, and I certainly don't want that becoming a 'requirement' as the norm.
If he had stated that this was exactly how it had happened, and no manipulation was done, then that would be wrong.
There are dozens of manipulated images on here every day, and theyre ALL part of the encompassing word that is photography.
YOU see photography as unmanipulated (or to be precise...manipulated, but only if its something that was there at the time, and its ok to manipulate it to make it look different to what was seen as long as you dont add anything extra or take anything away even if you're blending different exposures)
However, others don't.
Photography includes both the purists like yourself, and the creatives like others. It's ALL photography, and its ALL welcome on here, and people shouldn't have to explain themselves everytime they add something to an image, just to satisfy the purists.
Just like the purists shouldn't have to explain why they didn't add something that would make the image better.
I'm sorry Pete but you mentioned nothing of the overexposure of the fireworks, you steamed right in and said they shouldn't be there.
It all boils down to intolerance. You wouldn't do it, so you seem to have to tell others they wouldn't do it too, that's why this has blown up into a 4 pager

If you were more tolerant of others, and maybe said "I personally don't like adding elements into images that weren't in the original exposure, so this has ruined it for me. You've also forgotten that the 'extra' fireworks also need reflections

"
See? Much better. So yes, you have been a bad boy

and this *amount* of digital manipulation is fine, if the OP feels it is.
So I agree with both sides of the argument, photography is a personal preference, but once you start becoming intolerant of others then that's over the line IMO.