Not-so eagle-eyed, generalisations apart, re-read the posts - you have missed the point.
Many adults can barely cope with something as simple as turbulence - how is a child supposed to sort themselves out in an emergency whilst separated from their parent(s)?
It would most certainly be a natural parenty instinct to attempt to assist their children in such a situation and would cause chaos in an evacuation. That's the issue - nothing to do with timely arrival or otherwise at the gate.