slashlover
"But that could be someone two-years-and-one-day-old, and someone two-years-three-hundred-and-sixty-four-days-old, and my experience of having brought up children tells me that each of them in turn developed a great deal between those two ages, more or less from 'can speak in sentences which don't always make a lot of sense' to 'it starting to grasp the idea of actions having consequences, and of logic'."
I don't understand your point. The child was not the one buying the ticket, reading the T&Cs or making the choice to use that airline.
My point was nothing to do with who bought the ticket, and everything to do with the fact that there is a considerable developmental difference between a child 731 days old and a child 1094 days old, but both are called two-year-olds.
It is quite likely that a child near the younger end of that age might a screaming mask-refuser whilst one at the older end might be perfectly capable of understanding that wearing a mask is what is required on a plane flight and he or she wants to be grown up like mummy and daddy.
(The last bit of that sentence is debatable; I think the parents here have very little to distinguish them from a toddler in a tantrum because they couldn't have exactly what they wanted after they were told "no" by an adult. ymmv, and some people here clearly think these spoilt brats were in the right.)