The more I read here, the more I lose hope in my fellow man. The very divisiveness here is that which demonstrates the divisiveness that the song speaks of and calls for an end to. It's just a song asking for us all to get along. No, it's not a head banging song with screaming guitars and beer bottles flying at the audience. It's not a "let's kill them all and let God sort them out" song.
If there WERE more people who valued peace and brotherly love amongst all Men, there would be no such thing as terrorists. Obviously bin Laden and crew don't think much of John Lennon or his song either...
If the whole world were like Bermuda, we could all go to the beach every day.
In this world, peace is achieved by struggle and maintained by force or threat of force. It lasts only as long as the good guys are on top. We're the good guys. Some vicious idealogues from the Middle-East want to topple us. Good intentions and peace slogans don't even register on their radar.
Put on your armor and pick up your sword. Peace is under assault.