>>77882694Because it's a blend of the cartoon and the comic, mostly the comic to create a moive out of. You don't expect them to put even half of all that shit in the first movie, do you? They couldn't even find anyone to do the fucking movie for them for the longest time.
It's called an adaption, the idea is that it tries to adapt the idea of the comic/cartoon to the big screen as well as it can. The 1990 TMNT movie isn't perfect by any means, but it does an excellent job in bringing the Turtles to the big screen.
Besides all of the fighting and jokes, the 1900 movie actually took concepts like family and makes a central theme around it. The movie can take the time to actually back off from the other shit to try and have a few moments where the characters have to reflect of what just happened to them or what kind of situation they're in. Danny just seems like some random fuck they threw in, but when you think a bit about it, he's a reflection of how troubled teens end up in those kind of gangs anyway.
You remember Raph's fight with Casey Jones? After the fight, Raph goes back home, and Splinter talks to him about his anger, and how he always wants to deal with it by himself? And, the most important part, where he says to his brothers and him will always be there for him.
Compare this to Danny, where his dad doesn't understand him at all, and he runs off to the Foot's hideout, where Splinter claims he's their father, and will train them in the way of the foot.
Later on the movie, after Splinter is hauled off Raph goes off in a huff by himself, and the others leave him be, and then he gets his ass beaten to near death by a bunch of Foot Ninja. It comes full circle.
The movie's not perfect, but there's a lot more to it than you're willing to give it, and having all of that stuff you mentioned wouldn't have made for a better movie. If you want to complain about the lack of using material, go down and ask about III
