The characters are all idiots
Who sends a possible murder suspect being hunted by criminals home with his girlfriend and her dying mother? On the way the guy tells her he needs the address to have something sent over and she's like - ok.
The head of the police is almost as big an idiot at Veum.
I don't know how closely these films follow the books, but when almost all of the characters are this unbelievably stupid, it's most likely the writing that's to blame.