If the flight was delayed 15 minutes, they may have had more than 15 minutes to get the kid in the seat, given that airlines allow parents with small children to board first. So it doesn't sound like the parents were making that much of an effort.
If parents want to conduct a Middle East-level negotiation whenever they need to coax their child into a car seat in the family vehicle, fine. But they certainly have no right to hold up a commercial flight when their parenting skills prove ineffective.
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