Why does Nick take care of Gatsby's funeral in The Great Gatsby?
"I found myself on Gatsby's side, and alone." In Chapter Nine, Nick describes the rest of the day on which Gatsby has become the sacrificial victim of the "careless people," Daisy and Tom Buchanan. As he remains in Gatsby's house where Jay Gatsby lies dead, Nick says,
...it grew upon me that I was responsible because no one else was interested--interested, I mean, with that intense personal interest to which everyone has some vague right at the end.
Even Gatsby's father seems distanced from his son. When Nick asks if Mr. Gatz would rather take his son back to the West, the father replies that Jay always preferred the East. "He had a big future before him, you know," he adds, as though he were Gatsby's agent rather than his father.
When Nick tells Mr. Gatz, "We were close friends," he does not exaggerate. For no one else is as close. In fact, there is no one else. The business associates of Gatsby are afraid to attend; the house guest Klipspringer has found somewhere else to freeload, the Buchanans have exploited him, and can no longer use him.
Nick is Gatsby's only real friend. In addition to that, Nick also felt great admiration for Gatsby.
“They’re a rotten crowd,” I shouted across the lawn. “You’re worth the whole damn bunch put together.”
I’ve always been glad I said that. It was the only compliment I ever gave him, because I disapproved of him from beginning to end.
Even thought Nick wasn't entirely supportive of Gatsby's desire for an affair, he still wanted good things for Gatsby. Nick felt pity when on one else showed up for his funeral; not even Daisy.