My rant about smoking also applies, in a way to parents. Just because my colleages have kids and I don't, doesn't mean that I should have to cover all their work when they have to rush off home to see to little Billy's snotty nose or grazed knee.
Yes, I know kids need looking after, I don't have a problem with that, but I don't see why I (or other childless workers) should have to do extra work for no extra pay.
I worked in one place where a lass was constantly being summoned to pick up her child from school, or leaving early to take the child to bloody ballet or swimming class. Everyone was pissed off with it, yet we couldn't do anything about it. I'm sorry, but if you can't work the hours your job specifies, change your hours or get a different job.
A child is, in the main, a lifestyle choice, not a necessity. If you choose to have 'em, you also choose to manoeuvre your life around them. That's fine. Just don't expect me to have to manoeuvre my life around them too. Your kids, your responsiblity and, on occasion, your problem.
I know some people who have given up their jobs completely in order to look after young children. It's not an option for some people, but those I've seen who have done it, have managed to bring order into their lives - not an easy thing to do with kids.
Me, I'm childless by choice. I can do what I want, pretty much when I want and I can keep the bottle of bleach and the box of aspirin wherever I want. So many of my friends whinge about how lucky I am that I can do all the things I do, and I just smile and say "yes". Selfish? Damn right.
Despite my lack of interest in kids I will, of course be happy to babysit for anyone. My rates are £5,000 call-out fee + £1,000 per ten minutes thereafter ;o)