Maerry
Till now I think I came upon only one Naruto fic where Naruto (very OC, not lame like the original) explains that he had to save Kakashi because without him they all would probably die fighting against Zabuza (obviously he wouldn’t let them go). Which is probably the most logical explanation for his actions ever. I don’t know why it didn’t occurred to people that in this fight, without Kakashi it would be game over for them (I was one of them before reading that).