Imagine - John Lennon (Warning, slightly long question)

As the title says, I want to ask what you guys think about the song Imagine by John Lennon. Before you go on though, please try to not be biased. We know that Lennon was a great musician, but I was puzzled about how people interpreted his song on the Internet.
Apparently, Imagine says that in order to have and maintain a world of peace and Utopia, we have to have a place where there is ”...nothing to kill or die for. A brotherhood of man.” thus implying that we must be apathetic to everything in order for peace to be bestowed upon us.
I for one, think that Lennon’s intentions were not so when he wrote this classic, as Lennon lived and loved his share of life. However, this little argument was intriguing. What do you think?
(See the original argument on http://www.debate.org/debates/John-Lennons-song-Imagine-reflects-a-bleak-existence-rather-than-a-socialist-utopia./1/)