Oh how I long for a child I could order to stay in his pushchair! On trips out, if my attention is wandering, my sons have so many ways of pulling me back. They just get louder and naughtier until I'm there with them again.
I'm certainly guilty of ignoring mine at times when we're out, just as I'm guilty of ignoring them at home. I, too, have sighed at seeing dour-looking parents crassly ignoring their offspring, but I do agree with bea - you are only seeing a tiny fragment of their day. You don't witness the bedtime story and the silly singing in the car.Or if you want to paint a black picture, the one-hour shouting match and the cigarette stubbed on the child's arm. Either version could be true.
Slightly off at a tangent, but still on the subject of ignoring your chilcren, I do feel that combining adult socialising and taking children out is, IME, not always very practical and can be really detrimental to children.
I have had to tell two of my best friends that this summer, very sadly, I will not be able to go on days out with them.
They each have an older child - 7, 8 years old - friends of my oldest son. The older children all get on fine. They do their own thing (for some of the time) and we do ours. We seamlessly form a relaxed group.
But now my toddler comes into the equation. I simply cannot divide my attention between my toddler, my older son and another adult. Last summer, when my toddler was still taking long naps in his pushchair, it was easy to divide my attention between a friend and my older son. As my toddler got more demanding, I realised I was seeing him sometimes as a hindrance - and my friends were then following my lead. It just wasn't fair on him, so, for the time being, I am cutting out these group trips.