Vickie46 and it'll - just so you know, Southwest takes unaccompanied minors starting at age five. Since they let kids this young fly with their parents not even being on the plane, there's no reasonable argument against allowing young children to fly separated from their parents by just a few rows.
For parents concerned.about emergencies, well, apparently kids are better at following instructions - because of fire drills - than adults.
The difference is that parents who put their child on a plane unaccompanied are making that choice up front. They've probably prepped their child, and the child maybe already has previous experience traveling alone, and the child is hopefully ready (maturity wise) to travel alone.
For families traveling together, they probably had no intention whatsoever of their child sitting alone on the aircraft. The child is probably not prepared to do so. And the child may not be emotionally ready to be separated from their parent, even by a few rows. It may even be their first time on an airplane, which can be scary for some children.
I would strongly encourage the OP to buy the seats!!