Our reasons fo having DS done were the same as Mantaray's and Mel's, DH was in the army and had seen a lot of really bad infections of uncirced guys when they were out bush and that added to our decision.
Its a very very emotional issue and you will get passionate opinions from both sides, there have been many heated debates on BB about this in the past, maybe look at some old threads.
Whatever you decide is your choice, you have to choose what's best for YOUR family not worry about what other people think.