Because people have expanded the view of damn near everything to “well, it’s ok, it doesn’t really bother me and it makes you happy so it’s fine”. People need to relearn how to have some standards and a backbone. Turkey before tree is still apt and appropriate. Why not Christmas in April? Valentines in October? St Patrick’s in August? “It’s ok, it doesn’t bother me, and it makes you happy so it’s fine.”
I get what you are saying.
Also, it can in fact effect people that are not involved as that time comes from somewhere. So the largest bodied attended park closes early and those people all go to the other three parks.
It is ultimately a business, but it would not be right to see it does not play a role against other's enjoyment.
That is not even counting the cutbacks show maintenance and cleaning standards of changed because of events that sell late nights in the parks.