right, first, I take your point because before I became a parent I used to sit in airport lounges praying none of the little brats were sitting anywhere near me.
but, for all you bloody idiots, do you seriously expect that once someone has kids they should no longer be allowed to travel? How about people with family overseas, or people like us when we visited my wife's best friend in san francisco this spring (who is for ever making the effort to come and see us)? Believe me, taking a long-haul flight with a 1 year old and a 2 year old is not an enjoyable experience, especially when the airline insists on putting your pushchair in the hold (thanks BA) and you have to carry them, and all the many bags they require, all the way from the gate through immigration to baggage reclaim!
please, if you don't have kids, be tolerant of those who do. First, there's a pretty good chance it might be you one day. Second, even if you never have kids, the efforts of those of us who do will mean there are still doctors, nurses, engineers, IT geeks and (unfortunately) estate agents when you get old!