Would you risk your children?
I agree. On a one-off basis the risks are doubtless quite low, but if you're going to take a few dozen flights as a child then the risks will become more significant.
But this is hardly the only issue: as a parent, having your toddler sit 20 rows away might feel like a blessing. None of that constant making-sure they have their seatbelts on. No interminable repeat-readings of 'Thomas the Tank Engine'. No careful rationing of snacks when they seem about to have a tantrum. Somebody else can sort out the changing of nappies. Or else believe me they'll suffer for it.