Kate was relieved that they weren't on the first floor so didn't have to worry about what most likely would be a fatal or serious fall from the balcony, unlike a ground floor flat where the risk of fatal or serious injury would be much less. The fact that you have interpreted Kate's words to mean she didn't watch her kids on the patio or worry about them at all is YOUR biased conjecture, nothing more.
But of course she (and her husband) didnt when out every night with the doors left open, duh!
And why do you keep stating a fall from the balcony would be "cushioned" by steps? How do concrete steps cusion a fall? Besides, The vast majority of the balcony was nowhere near the steps....!
There were chairs on the patio as well, for unknowing kids to climb on and potentially topple over...why dont you stop your safe mantra
Lastly, when she was indoors having a shower and presumably the kids left outside the bathroom, and payne knocked, he says the patio door was open
??
Getting back to the point , that section in her book was an untruth....ie that she felt no worries of her kids falling over a balcony as others must have done, cos they were on the GROUND FLOOR
well, theres only a worry if you ever LEAVE your kids in any position to do so...maybe the paynes werent worried at all? Maybe they LOCKED the damn door and watched their kids at all times