Hmm, yeah funny - from two of our childless contributers. Look, I know some parents don't do a good job controlling their kids but the vast majority of us do, and we do care about our fellow travellers' comfort.
Do you know what it is like to have people sigh and huff and roll their eyes just because you sit near them with a child on a plane? Do you know what kind of pressure that puts a parent under? Kids are kids, and even the best parented child in the world will sometimes 'go off on one' and Sod's Law dictates that will happen at the most inconvenient and embarassing time possible. We do our best - you fucking try it.
And as for charging us more, or denying us the opportunity of the same travel options as childless people... well fuck you. You want to travel without hearing kids? You fucking stump up for first class or get in your own damn car and drive where you're going - you have more disposable income with no kids to feed, after all, dontcha.
Show some fucking understanding.
Oh, and as for charging very fat people more. No. Just no. One seat, one price.